| 摘要 |
Adhesive compositions are described comprising (1) polyisobutylene (high molecular weight) and polyisobutylene (viscous liquid), (2) polyvinyl ethyl ether, hydrogenated rosin, and polyethylene glycol diricinoleate, (3) butadiene/styrene copolymer, ester of hydrogenated rosin, petroleum oil and phenyl-a -naphthylamine, (4) polyvinyl acetate, "Santicizer" (Registered Trade Mark) and wax, (5) polyvinyl butyral, Santicizer, heat-treated wood rosin, "Armid" (Registered Trade Mark) and castorwax, (6) nitrocellulose, dibutyl phthallate, ethanol, toluene, Dammar wax and paraffin wax.ALSO:A flexible web product comprising a base web and a coating combination comprising a pressure-sensitive adhesive coating on the base web and a tackless agent-activated adhesive coating on the pressure-sensitive adhesive coating, the surface of said tackless agent-activated adhesive coating remote from said pressure-sensitive adhesive coating being one of the two outermost faces of said web product, where the adhesion across the interface between the base web and the pressure-sensitive adhesive coating is weaker than the adhesion across the interface between the pressure-sensitive adhesive coating and the tackless agent-activated adhesive coating. The agent-activated coating may be heat or solvent-sensitive. A release coating may be applied to the base before the application of the pressure-sensitive adhesive coating. The backing may be of paper or other film material. The pressure-sensitive adhesives may comprise materials made from butadiene-styrene copolymers or from natural rubber, varying proportions of synthetc resins, mineral fillers, plasticisers, antioxidants and other additives or vinyl polymers or polymers of methacrylic acid esters or other acrylic acid esters. As tackifiers may be dehydrogenated or hydrogenated rosin, polyvinyl ethers, pine tar and methyl esters of hydrogenated rosin, terpene polymers and hydrogenated coumarone-indene resins. The release coating may be "Syl-off 22" or a silicone polymer composition. The coatings may be applied using suitable solvents and a heat-activated coating may be applied as a melt. |
