Claims
- 1. 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, having the ability to gel the chlorinated vinyl chloride,
- (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.
- 2. The foamed article of claim 1, wherein said inorganic fibrous material is asbestos.
- 3. The foamed article of claim 1, wherein said inorganic fibrous material is glass fiber.
- 4. The foamed article of claim 1, wherein said inorganic fibrous material is rock wool.
- 5. The foamed article of claim 1, wherein the article contains an inorganic fibrous material and inorganic particles.
- 6. The foamed article of claim 1, wherein the chlorine content of said chlorinated vinyl resin is 57 to 75% by weight.
- 7. The foamed article of claim 1, wherein the expansion ratio is 5 to 200 times.
- 8. The foamed article of claim 1, wherein the article contains a phosphoric ester.
- 9. The foamed article of claim 8, wherein said phosphoric ester is an orthophosphoric ester.
- 10. The foamed article of claim 8, wherein said phosphoric ester contains not less than 7% by weight of phosphorus.
- 11. The foamed article of claim 8, wherein said phosphoric ester contains a halogen atom other than phosphorus.
- 12. The foamed article of claim 8, wherein said phosphoric ester is tris(chloroethyl) phosphate.
- 13. The foamed article of claim 8, wherein the content of said phosphoric ester is 5 to 50 parts by weight based on 100 parts by weight of the chlorinated vinyl chloride resin.
- 14. The foamed article of claim 8, wherein said inorganic material contains an inorganic fibrous material and antimony trioxide.
- 15. The foamed article of claim 8, wherein the chlorine content of said chlorinated vinyl chloride resin is 68 to 75% by weight.
- 16. The foamed article of claim 1, wherein said chlorinated vinyl chloride resin has 300 to 5000 of average degree of polymerization.
- 17. The foamed article of claim 1, wherein said solvent has an ability to gell the chlorinated vinyl chloride resin.
- 18. The foamed article of claim 17, wherein said solvent is at least one member selected from the group consisting of an aromatic hydrocarbon, a halogenated hydrocarbon, a compound containing a hydroxyl group and an ester group, an ester, a carbonic acid derivative and a phosphorus compound.
- 19. The foamed article of claim 1, wherein the content of said solvent is 10 to 1000 parts by weight based on 100 parts by weight of the chlorinated vinyl chloride resin.
- 20. The foamed article of claim 1, wherein said foamable composition contains a stabilizer.
Priority Claims (4)
Number |
Date |
Country |
Kind |
61-184685 |
Aug 1986 |
JPX |
|
61-193770 |
Aug 1986 |
JPX |
|
61-208422 |
Sep 1986 |
JPX |
|
61-289586 |
Dec 1986 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of application Ser. No. 082,692 filed on August 5, 1987.
US Referenced Citations (11)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
82692 |
Aug 1987 |
|