丙烯酸系压敏胶：—溶剂型丙烯酸系压敏胶

一、前言现在,作为压敏胶的主要材料是丙烯酸系、天然橡胶及合成橡胶。丙烯酸系压敏胶的使用量与橡胶系压敏胶相比显示着较大的增长率。丙烯酸系压敏胶的优点是耐热性和耐候性,它可以保持相当长时间的稳定性。再有,由于丙烯酸系的单体种类比较多,采     

影响丙烯酸系压敏胶性能的主要因素(摘要)

从六十年代丙烯酸系压敏胶进入市场之后,引起了国内外研究者的关注,对影响压敏胶性能的因素进行了较多的研究. 本文在实验的基础上,从压敏胶的配方、聚合工艺和压敏胶制备等方面探讨了影响丙烯酸系压敏胶性能的主要因素. 一、配方设计与性能的关系     

丙烯酸系压敏胶（续）

三、丙烯酸系压敏胶的生产方法溶剂型丙烯酸系压敏胶一般是通过自由基引发剂进行自由基聚合反应的。通过引发剂的分解、开始反应、链增长、链转移、链终止等符合基础理论的反应。前面讲到丙烯酸系压敏胶的分子设计是较复杂的。     

西方压敏胶近况

据 Roche 公司咨询部统计,压敏胶用树脂约14.9万 t,其中溶剂型天然橡胶4.85万 t,溶剂型共聚物5.22万 t,丙烯酸类乳液2.98万 t,热熔型1.87万 t。压敏胶大约还用11.2万 t 增粘剂、填料和增塑剂,合计压敏胶总量达26.1万 t。Union Carbide 公司生产丙烯酸系乳液;Shell Chemical 公司生产苯乙烯嵌段共聚物;     

辐射固化压敏胶粘剂

与传统的压敏胶制备类型（溶剂型、乳液型和热熔型）不同，本文提出了第四种制备压敏胶的类型，即辐射固化型（主要是UV辐射），使用新技术以消除压敏胶制造过程中使用的溶剂和分散介质。UV压敏胶技术还可分为热熔型UV压敏胶和常温涂布型UV压敏胶两种。其中热熔型UV压敏胶需进行加热，以使涂布过程容易进行。在此类压敏胶的聚合物中含有UV敏感性化合物，以利于交联反应的进行，并提高压敏胶产品的剪切性和高温性能。常温涂布型UV压敏胶是液态的，其粘度适合常温涂布。大多UV固化压敏剂只是最近几年才开始商业化。丙烯酸共聚物本身具有压敏的性质，很适于制备辐射固化压敏胶粘剂。常用的常温涂布UV压敏胶粘剂包括热塑性弹性体溶于丙烯酸单体所形成的体系、丙烯酸化的丙烯酸聚合物溶于丙烯酸单体所形成的体系和丙烯酸聚氨酯溶于丙烯酸单体所形成的体系。当在光引发剂存在下，用UV光照射，则丙烯酸单体发生反应生成聚合物而成为胶粘剂的一个组成部分。用于此类胶粘剂体系的常用反应性稀释剂有丙烯酸2－乙基己酯、乙氧基化丙烯酸壬基酚酯和乙氧基化丙烯酸乙酯等。     

丙烯酸系乳液压敏胶的研制

一、前言近几年来,我国以丙烯酸系乳液压敏胶制备的胶粘带和胶粘片的生产发展很快,其主要原因是由于丙烯酸系聚合物与其它聚合基料相比较,具有透明性、耐候性和耐油性优良等许多优点。而且由于丙烯酸系单体能比较容易地和其它乙烯类单体共聚,所以可任意地进行粘合剂的配方设计,以满足特殊条件的要求。同时,丙烯酸系压敏胶加工工艺简单,使用方便。把它们贴在金属、塑料、     

接枝改性丙烯酸乳液压敏胶的研制

通过采用接枝聚合工艺将甲基丙烯酸甲酯接枝到丙烯酸乳液的分子中,研制出一种新型的丙烯酸乳液可剥离压敏胶,用透射电镜和示差扫描量热仪对其进行了分析。实验结果表明：接枝聚合物的乳胶粒呈雪人型,而未接枝的、共混的丙烯酸乳液粒子呈圆形。接枝聚合物的玻璃化温度与未接枝、共混的丙烯酸乳液不相同。在主配方基本不变的条件下,通过调节接枝甲基丙烯酸甲酯的用量,可得到性能良好的乳液型可剥离压敏胶。当丙烯酸用量为4％,引发剂用量为0．4％,丙烯酸-2-羟丙酯用量为2％时,压敏胶性能良好。经过优化配方,合成了满足企业产品质量要求的压敏胶。     

溶剂型丙烯酸系压敏胶的研制

介绍了用于表面保护膜的溶剂型丙烯酸酯类压敏胶的合成工艺，研究了各种因素对其性能的影响，制得了性能优良的表面保护膜用丙烯酸系压敏胶。     

大分子引发聚合丙烯酸医用压敏胶实验研究

本文研究了以大分子引发剂聚合的丙烯酸乳液型压敏胶。聚合过程中不同单体的合成条件及其对压敏粘接性能的影响。实验表明，大分子偶氮酰胺为引发剂对产物的性能有显著影响，对丙烯酸乳液型压敏胶的内聚能、粘弹性有一定改善并提高了粘接性能。     

胶粘剂新专利

金属粘接用胶粘剂;冷密封胶粘剂;医用胶粘剂和组织的胶粘方法;悬浮分散有Fentanyl（芬太尼）的硅酮压敏胶和Fentanyl透皮贴剂;偏振片用压敏胶以及含压敏胶的偏振片和光膜的生产工艺;水基压敏胶、压敏胶带和线束;苯乙烯聚合物粘接用胶粘剂层组成及其制品;压敏胶组成;导热压敏胶组成、导热片型泡沫及其制造方法;粘接织物／EPDM橡胶的胶粘剂组成;含可逆封闭型（reversibly blocked）催化剂的单组分可湿气固化聚氨酯泡沫胶粘剂及其应用;丙烯酸系压敏胶及其胶带;医用胶粘剂组成;单组分聚氨酯胶粘剂。     

Influence of selected photoinitiators type II on tack,peel adhesion,and shear strength of UV-crosslinked solvent-borne acrylic pressure-sensitive adhesives used for medical applications

This article describes the photoreactive UV-crosslinkable solvent-borne acrylic pressure-sensitive adhesives (PSA) containing unsaturated copolymerizable photoinitiators and their synthesis. The solvent-borne acrylic PSA were synthesized in ethyl acetate as a solvent, and the copolymerizable photoinitiators type II, known as hydrogen abstractors, were incorporated into acrylic polymer chain during conducted radical polymerization process. The synthesized solvent-borne acrylic PSA containing different unsaturated photoinitiators were investigated to evaluate their relevant and significant properties such as tack, peel adhesion, and shear strength after UV exposure.     

Studies on the water resistance of acrylic emulsion pressure-sensitive adhesives (PSAs)

Four different types of acrylic emulsion pressure-sensitive adhesives (PSAs) with the same composition of their constituent co-polymers but stabilized by four different anionic surfactants, two conventional low-molecular-weight surfactants (a sodium salt and an ammonium salt) and two anionic monomers (a sodium salt and an ammonium salt) were prepared. The adhesion properties of the four types of PSA tapes coated onto PET (poly(ethylene terephthalate)) sheets were determined with the national standard methods of China. Water absorption and water solubility of PSA films were determined by the gravimetric method. The peel-strength retention of PSA tapes after immersion in water was compared. The results showed that both the adhesion properties and the water resistance of the acrylic PSAs stabilized by anionic monomers were better than that of the acrylic PSAs stabilized by low-molecular-weight surfactants, and the ammonium surfactants were better than the sodium surfactants. These differences were mainly caused by the different migration ability of the four surfactants in the PSA layers and their different hydrophilic nature, as explained in terms of surfactant content at the surfaces of PSA layers with X-ray photoelectron spectroscopy (XPS).     

Miscibility and PSA Performance of Acrylic Copolymer and Tackifier Resin Systems

The influence of miscibility of an acrylic PSA and several tackifier resin systems upon PSA performance was investigated. When the acrylic copolymer and the resins were blended in various proportions, three types of mixing state were found: miscible system, partially miscible system and immiscible system. In the case of miscible systems, PSA performance (tack, peel strength and shear resistance) depended upon the viscoelastic properties of the PSA. In the case of completely immiscible systems, the above PSA performance depended primarily upon the viscoelastic properties of a continuous matrix phase, and the separated resin phase acted as a kind of filler. In the case of partially miscible systems, the PSA performance changed discontinuously at the resin concentration where phase separation occurred. It suggests that the phase structure of a PSA greatly influences the PSA's performance.     

Acrylic pressure‐sensitive adhesive for transdermal drug delivery systems

This article describes the development in the area of resin‐free acrylic pressure‐sensitive adhesive (PSA) based on 2‐ethylhexyl acrylate, methyl acrylate, acrylic acid, N‐vinyl caprolactam, and pregnancy transdermal drug delivery systems, and shows the variety of polymer composition, residue monomers content, quality control of peel adhesion level and repeating during the time, biocompatibility of the acrylic PSA layer, and efficacy in clinical medicine. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Multifunctional propyleneimines-new generation of crosslinkers for solvent-based pressure-sensitive adhesives

This article describes work with the goal of crosslinking pressure sensitive acrylic adhesives (PSA) and a new generation of crosslinkers based on multifunctional propyleneimine derivates. Crosslinking of PSA is an established technology used in many industrial manufacturing processes. New applications and technical specifications stimulate the continuous development of new crosslinking agents with very interesting properties. These new crosslinkers influence physico-mechanical properties of acrylic PSA such as tack, peel resistance (adhesion) and shear strength (cohesion). The weak point of propyleneimine crosslinkers is their very short potlife.     

Miscibility and PSA Performance of Acrylic Copolymer and Tackifier Resin Systems

The influence of miscibility of an acrylic PSA and several tackifier resin systems upon PSA performance was investigated. When the acrylic copolymer and the resins were blended in various proportions, three types of mixing state were found: miscible system, partially miscible system and immiscible system. In the case of miscible systems, PSA performance (tack, peel strength and shear resistance) depended upon the viscoelastic properties of the PSA. In the case of completely immiscible systems, the above PSA performance depended primarily upon the viscoelastic properties of a continuous matrix phase, and the separated resin phase acted as a kind of filler. In the case of partially miscible systems, the PSA performance changed discontinuously at the resin concentration where phase separation occurred. It suggests that the phase structure of a PSA greatly influences the PSA's performance.     

Synthesis and characterization of thermally stable acrylic PSA using silicone urethane methacrylate with a semi-IPN structure

To improve the thermal properties of acrylic PSA, silicone urethane methacrylate (SiUMA) is applied to acrylic PSA using a semi-interpenetrating polymer network (IPN) structure. Acrylic PSA was prepared by free radical polymerization and SiUMA was synthesized by additional polymerization via urethane linkage. By preparing synthetic SiUMA formed in a semi-IPN structure in acrylic PSA, the thermal stability can be verified with the shear adhesion failure temperature using 1?kg plumb weight. Normally, acrylic PSA can easily be cleared from the substrate at less than 50° C; but when using SiUMA at 10%, it can be resistant up to 100?C. When measuring the photo-DSC value, a 5.0?phr photoinitiator and UV intensity of 1000?mJ/cm² can be used to complete the curing reaction. Two types of chain polymers – short and long chain polymers – were synthesized, and the structure was confirmed through FT-IR and gel permeation chromatography. By measuring the Thermogravimetric analyses, the cross-linking effect and improvement of the thermal resistance can be checked using silicone materials. With advanced rheometric expansion system, the thermal property changes and viscoelastic changes were detected. In this study, the mobility of silicone is detected while moving onto an air interface. The result of this study can provide information with which to improve the thermal stability when using SiUMA with a semi-IPN structure and acrylic PSA.     

Photocrosslinking of solvent-based acrylic pressure-sensitive adhesives (PSA) by the use of selected photoinitiators type I

This study investigated the photocrosslinking of solvent-based acrylic pressure-sensitive adhesives (PSA) containing selected photoinitiators type I, known as α-cleavage photoinitiators. Photocrosslinking of PSA, especially of acrylic PSA, is well established crosslinking process using the UV radiation technology. UV-initiated crosslinking of acrylic PSA allows the synthesis of the wide range of UV-crosslinkable PSA with the interesting features. Especially, the important balances of properties such as adhesive and cohesive strength which are typically critical for the application performance can be achieved by this technology. The selection of suitable photoinitiator plays an important role to obtain the optimum properties of acrylic PSA including tack, peel adhesion, and shear strength. In this study, the investigations on different saturated conventional photoinitiators of type I for solvent-based PSA were carried out. The effects of photoinitiator concentration, UV crosslinking time and UV dose on the tack, peel strength, and shear strength were explored in detail for guiding the choice of photoinitiators to fabricate advanced PSA for industrial usage.     

How does the surface free energy influence the tack of acrylic pressure-sensitive adhesives (PSAs)?

This article describes a comparative study of the tack properties of a model acrylic pressure-sensitive adhesive (PSA) crosslinked using aluminum acetylacetonate on several substrates, including stainless steel, glass, polyethylene, polypropylene, polytetrafluoroethylene, polycarbonate, and poly(methyl methacrylate). The tack measurements were conducted using a technique commonly used to measure the tack of an adhesive tape in the PSA industries. The surface free energy (SFE) values of the materials were evaluated using the Owens–Wendt and van Oss–Chaudhury–Good methods. The experiments showed a clear relationship between the SFE of the substrate and the tack of the model acrylic PSA. In general, larger differences between the SFE values of the substrate and adhesive (Δ_SFE) were correlated with greater tack values. The tack of the model acrylic PSA was found to be optimal over the Δ_SFE range of 7.0–13.1 mJ/m². The trend in the tack as a function of the SFE difference was attributed to the quantity of energy dissipated at the jointed points during the separation stage in the loop tack test.     

Preparation and adhesion performance of transparent acrylic pressure sensitive adhesives for touch screen panel

Transparent acrylic pressure sensitive adhesives (PSAs) comprised semi-interpenetrated structured polymer networks were prepared with different co-monomer compositions. Emphasis was placed on the effect of functional groups in the co-monomer including morpholine and tetrahydrofurane moieties in the typical acrylic PSA formulation. The synthesized acrylic PSA syrups were characterized and the optical properties of the acrylic PSA film were also examined by ultraviolet–visible spectroscopy, haze meter, and prism coupler. Acrylic PSAs exhibit high transparency in the visible wavelength region. Adhesion performance was measured by the peel strength, cohesion strength, and probe tack tests. With increasing 4-acryloyl morpholine monomer concentration in the acrylic PSAs, the peel strength, cohesion strength, and probe tack increased.