Patent ID: 6166110
Filing Date: 2000-12-26
Classification: B29C

Abstract:
A continuous solventless hot melt process for preparing a pressure sensitive adhesive composition comprising:(a) providing a first elastomer to a first section of a continuous compounding device;(b) masticating the first elastomer for a time sufficient to produce a masticated first elastomer having a melt viscosity less than the melt viscosity of the first elastomer prior to masticating;(c) adding a first tackifier that is compatible with the first elastomer to form a mixture comprising the first elastomer and first tackifier;(d) adding a second elastomer to the mixture comprising the first elastomer and first tackifier in a subsequent section of the continuous compounding device, wherein the second elastomer is a different elastomer than the first elastomer;(e) masticating and mixing the second elastomer with the mixture comprising the first elastomer and the first tackifier to form a mixture comprising two different elastomers and a tackifier;(f) adding a second tackifier to the mixture comprising two different elastomers and a tackifier, wherein the second tackifier is the same or a different tackifier than the first tackifier; and(g) forming an adhesive composition.