Adhesive compositions comprising block copolymers of a monovinylaromatic compound and butadiene
US5948527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1998 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jan 20, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Hot melt adhesive compositions, comprising PA1 (a) a radial multiarmed block copolymer (AB).sub.n X, wherein A is a block predominantly derived from a monovinylaromatic compound, B is a block predominantly derived from butadiene and which optionally has been partially or completely hydrogenated, PA2 X is the residue of a multifunctional coupling agent, PA2 n is in the range of from 3 to 6, PA1 (b) a linear block copolymer AB, the components (a)+(b) being present in an amount of 100 parts by weight, PA1 (c) a tackifying resin, which is compatible with the blocks B, in an amount of from 100 to 500 parts by weight, PA1 (d) a plasticizer in an amount of from 100 to 300 parts by weight, PA1 (e) an antioxidant-UV stabiliser in an amount from 0.1 to 5 parts by weight, PA2 characterised in that the content of bound monovinylaromatic monomer in the block copolymers is at least 20%, PA2 the vinyl content in the polymerised butadiene is at least 25%, PA2 the diblock content, relative to the weight of components (a) and (b) is in the range of from 6 to 25%, PA2 the diblock has an apparent molecular weight in the range of from 70,000 to 100,000 and the radial multiarmed block copolymer has an a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.