Radial styrene-isoprene-butadiene multi-armed block copolymers and compositions and articles containing block copolymers
US5399627A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 24, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2754
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention is drawn to radial block copolymers of the formula: EQU (pS--pI--pB).sub.n X wherein pS is polystyrene, pI is polyisoprene, pB is polybutadiene, X is the residue of a multifunctional coupling agent used in the production of the radial block copolymer, and n is a number greater than or equal to 3 representative of the number of branches appended to X; pressure sensitive adhesive compositions comprising such radial block copolymers and articles of manufacture produced therefrom. The pS component of the radial block copolymers of this invention comprise from about 14 to about 24 parts per 100 parts by weight of the radial block copolymer; the molecular weight (as polystyrene equivalent) of the radial block copolymer is between about 200,000 to about 400,000; and the weight amount of polybutadiene in the pI--pB segment is less than 50 weight percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.