High-strength films of block copolymer latices
US5578674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2353/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
What is claimed is a coherent, elastomeric, solid, free-standing film comprising an organic phase comprising: (a) one or more block copolymer(s) corresponding to the formula: EQU A--B--X.sub.m --(B--A).sub.n wherein each A is a polymer block consisting essentially of a monovinylidene aromatic monomer, each B is a polymer block consisting essentially of a conjugated diene and, optionally, a monovinylidene aromatic monomer, X is the remnant of a multifunctional coupling agent, m is 0 or 1, and n is an integer from 1 to 5, each monovinylidene aromatic monomer block having a weight average molecular weight from about 8,000 to about 15,000 Daltons, each conjugated diene block having a weight average molecular weight from about 30,000 to about 200,000 Daltons, and (b) optionally, an extender which is compatible with the B block; wherein the A block comprises 5 to 25 percent by weight of the organic phase and exhibits an effective phase volume in the organic phase from about 5 to about 20 percent and the amount of extender present is sufficient to achieve the desired effective phase volume of the A block, wherein the film is annealed and demonstrates a tensile strength of 11.0 MPa or grea…
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