Ultra low density polyolefin foam, foamable polyolefin compositions and process for making same
US5225451A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Aug 27, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A foamable composition for producing an ultra low density polyolefin foam having a density of about 0.6 to about 1.5 pounds per cubic foot comprising a heat-plastified mixture comprising (1) an olefin polymer resin selected from the group consisting of ethylene homopolymers and copolymers of ethylene and a copolymerizable monomer; (2) an elastomer in an amount of about 3 to about 30 wt. parts per 100 wt. parts of said olefin polymer resin; (3) polystyrene in an amount of about 1 to about 15 wt. parts per 100 wt. parts of said olefin polymer resin; (4) a stability control agent selected from the group consisting of partial esters of long chain fatty acids with polyols, higher alkyl amines, fatty acid amides, and olefinically unsaturated carboxylic acid copolymers, and (5) a hydrocarbon blowing agent having from 1 to 6 carbon atoms and a boiling point between -175.degree. C. and 50.degree. C., said heat-plastified mixture being at a temperature and a pressure which does not allow said mixture to expand, said low density polyolefin foam made from said foamable composition and process of making said foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.