申请人:UNION OIL COMPANY OF CALIFORNIA
公开号:EP0296286A1
公开(公告)日:1988-12-28
Normally tacky, pressure sensitive adhesive compositions comprise one or more polymers containing pendant functional groups attached to a polymer backbone and having the formula:
in which R, is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano, and wherein said polymer is selected from
(1) conjugated diolefin polymers comprising at least about 30 weight percent of one or more conjugated diene monomers having 4 to about 8 carbon atoms and 0 to about 70 weight percent of one or more alkenyl-substituted monoaromatic monomers,
(2) olefin ester interpolymers comprising at least about 1 weight percent of a monoolefin monomer having up to about 4 carbon atoms and at least about 40 weight percent of an alkenyl or alkenol ester of a saturated carboxylic acid,
(3) olefinically unsaturated carboxylic acid ester polymers comprising at least about 40 weight percent polymerized olefinically unsaturated carboxytic acid ester monomers,
(4) alkenyl ether polymers comprising at least about 30 weight percent alkenyl ether monomer units, and
(5) combinations thereof.
Such polymers have improved cohesive strength with little or no detriment to adhesive tack or adhesion, and these improvements are realized without the necessity of incorporating crosslinking monomers such as N-methylolamides or other crosslinking agents. Pressure sensitive adhesive, water-based emulsions, hot melts and solutions containing such polymers and adhesive articles having at least a portion of one surface thereof coated with such adhesives are also provided.
通常具有粘性的压敏粘合剂组合物由一种或多种聚合物组成,这些聚合物含有连接到聚合物主链上的挂接官能团,其结构式如下:
其中 R 是长度至少为 3 个原子的二价有机基,X 是有机酰基或氰基,且所述聚合物选自以下各项
(1) 共轭二烯烃聚合物,包含至少约 30 重量百分比的一种或多种具有 4 至约 8 个碳原子的共轭二烯单体和 0 至约 70 重量百分比的一种或多种烯基取代的单芳香族单体、
(2) 烯烃酯间聚合物,包括至少约 1 重量百分比的具有最多约 4 个碳原子的单烯烃单体和至少约 40 重量百分比的饱和羧酸的烯基或烯醇酯、
(3) 烯烃不饱和羧酸酯聚合物,包括至少约 40%重量百分比的聚合烯烃不饱和羧酸酯单体、
(4) 烯基醚聚合物,包括至少约 30%重量百分比的烯基醚单体单元,以及
(5) 它们的组合。
此类聚合物具有更高的内聚强度,对粘合剂的粘性或附着力几乎没有损害,而且无需加入交联单体(如 N-甲基酰胺或其他交联剂)即可实现这些改进。此外,还提供了含有此类聚合物的压敏粘合剂、水基乳液、热熔胶和溶液,以及至少有一部分表面涂有此类粘合剂的粘合物品。