Polyurea-based adhesives, articles therefrom and methods of their preparation and use
US6824820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1999 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2826
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An adhesive composition comprisinga silicone free polyurea-based polymer, comprising a segmented copolymer, wherein the copolymer comprises repeating units of Formula I: wherein:each B is independently a polyvalent radical selected form a group consisting of arylene, aralkylene, cycloalkylene, polyoxyalkylene, or mixtures thereof;each D is independently selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, a phenyl group, a group that completes a ring structure that includes B to form a heterocycle, and mixtures thereof;each Z is independently a polyvalent radical having about 1 to about 20 carbon atoms;each Y is independently a polyoxyalkylene;m is an integer greater than zero; anda is zero or an integer greater than zero; andwherein the composition comprises a tackifier in an amount sufficient to provide the adhesive composition as a pressure sensitive adhesive and in an amount less than about 45 parts by weight tackifier per hundred part by weight polyurea-based polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.