Patent ID: 6218457
Filing Date: 2001-04-17
Classification: C08L,C09J

Abstract:
A high peel and shear strength hot melt adhesive composition consisting essentially of a blend of:(a) about 15% to about 65% by weight of a polybutylene polymer, said polybutylene polymer selected from the group consisting of polybutylene homopolymer, polybutylene copolymer, and blends of polybutylene homopolymer and copolymer;(b) about 0.1% to about 3% by weight of a stabilizer; and(c) about 5% to about 20% by weight of a polypropylene wax having a softening point of 200.degree. F. to 350.degree. F.;the remaining ingredients chosen from one or more of the following components so that the ingredients add up to 100% by weight based on the weight of the entire composition:(d) about 0% to about 60% by weight of a hydrocarbon tackifying resin, said tackifying resin is selected from the group consisting of aliphatic hydrocarbon resins, hydrogenated aromatic hydrocarbon resins, hydrogenated aliphatic hydrocarbon resins and hydrogenated aromatic/aliphatic hydrocarbon resins; and(e) about 0% to about 30% by weight of a plasticizer selected from the group consisting of mineral oil, and polybutene having a molecular weight of 2000 or less;and wherein the minimum polybutylene polymer content is 15% by weight;and wherein the adhesive composition has a viscosity of less than 25,000 cP at 350.degree. F. and a melt point higher than 250.degree. F., and withstands a peel mode force of 500 grams at 100.degree. F. for a minimum of about 11 hours and further withstands a shear mode force of 1000 grams at 100.degree. F. for a minimum of about 11 hours.