Expandable particles of a styrene polymer having small particle size
US4191803A · kind A · utility
5Cited by
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4Claims
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Assignee
Inventor
Key dates
| Filing date | Nov 17, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Nov 17, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Expandable particles of a styrene polymer containing therein 3 to 8% by weight of a blowing agent and having a particle size of 0.8 to 0.25 mm. in diameter, or their pre-expanded particles, which comprises an ester of sucrose represented by the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represent a hydrogen atom, an alkanoyl group having 6 to 22 carbon atoms or an alkenoyl group having 6 to 22 carbon atoms; and all of R.sub.1, R.sub.2 and R.sub.3 are not hydrogen atoms at the same time, or its derivative, said ester of sucrose or its derivative being coated on the surface of said particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.