Foamed article of chlorinated vinyl chloride resin containing inorganic material
US4980383A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Nov 30, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A foamed article of a chlorinated vinyl chloride resin containing an inorganic material, which contains an inorganic fibrous material in an amount of not less than 0.003 g per 1 cm.sup.3 of the article or inorganic particles in an amount of not less than 0.06 g per 1 cm.sup.3 of the article and which has dimensional retention of not less than 70% when the article is heated at 200.degree. C. for one hour and an expansion ratio of not less than 5 times, which is prepared by the process comprising the steps of (1) preparing a foamable composition by kneading a mixture comprising a chlorinated vinyl chloride resin, an inorganic material, a chemical blowing agent and a solvent, (2) filling a closable mold with the foamable composition, (3) heating the foamable composition under pressure in the mold to generate a gelled chlorinated vinyl chloride resin and to decompose said chemical blowing agent, (4) cooling the foamable composition in the mold to a temperature suitable for expansion, and (5) opening the mold to give a foamed article. The foamed article has excellent dimensional retention at high temperatures as well as excellent mechanical property and shows little calorie, smoke and p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.