US4980383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed article of chlorinated vinyl chloride resin containing inorganic material
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1988-11-30
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Granted: 1990-12-25
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Expires: 2008-11-30
Abstract
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 cm3 of the article or inorganic particles in an amount of not less than 0.06 g per 1 cm3 of the article and which has dimensional retention of not less than 70% when the article is heated at 200 DEG 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 poison gas.
Inventors
- 👤 Hisao Shimazu
- 👤 Yoshihiro Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:41
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08K; C08K7/00; C08K7/02; C08K7/04; C08J2327/00; C08J2327/22; C08J2327/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
187 words
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 3 of the article or inorganic particles in an amount of not less than 0.06 g per 1 cm 3 of the article and which has dimensional retention of not less than 70% when the article is heated at 200 °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.
Claim 2
Dependent Claim
187 words
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 3 of the article or inorganic particles in an amount of not less than 0.06 g per 1 cm 3 of the article and which has dimensional retention of not less than 70% when the article is heated at 200 °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.
Claim 3
Dependent Claim
13 words
The foamed article of claim 1, wherein said inorganic fibrous material is asbestos.
Claim 4
Dependent Claim
14 words
The foamed article of claim 1, wherein said inorganic fibrous material is glass fiber.
Claim 5
Dependent Claim
14 words
The foamed article of claim 1, wherein said inorganic fibrous material is rock wool.
Claim 6
Dependent Claim
17 words
The foamed article of claim 1, wherein the article contains an inorganic fibrous material and inorganic particles.
Claim 7
Dependent Claim
21 words
The foamed article of claim 1, wherein the chlorine content of said chlorinated vinyl resin is 57 to 75% by weight.
Claim 8
Dependent Claim
15 words
The foamed article of claim 1, wherein the expansion ratio is 5 to 200 times.
Claim 9
Dependent Claim
13 words
The foamed article of claim 1, wherein the article contains a phosphoric ester.
Claim 10
Dependent Claim
14 words
The foamed article of claim 8, wherein said phosphoric ester is an orthophosphoric ester.
Claim 11
Dependent Claim
19 words
The foamed article of claim 8, wherein said phosphoric ester contains not less than 7% by weight of phosphorus.
Claim 12
Dependent Claim
17 words
The foamed article of claim 8, wherein said phosphoric ester contains a halogen atom other than phosphorus.
Claim 13
Dependent Claim
13 words
The foamed article of claim 8, wherein said phosphoric ester is tris(chloroethyl) phosphate.
Claim 14
Dependent Claim
32 words
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.
Claim 15
Dependent Claim
18 words
The foamed article of claim 8, wherein said inorganic material contains an inorganic fibrous material and antimony trioxide.
Claim 16
Dependent Claim
22 words
The foamed article of claim 8, wherein the chlorine content of said chlorinated vinyl chloride resin is 68 to 75% by weight.
Claim 17
Dependent Claim
21 words
The foamed article of claim 1, wherein said chlorinated vinyl chloride resin has 300 to 5000 of average degree of polymerization.
Claim 18
Dependent Claim
19 words
The foamed article of claim 1, wherein said solvent has an ability to gell the chlorinated vinyl chloride resin.
Claim 19
Dependent Claim
46 words
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.
Claim 20
Dependent Claim
31 words
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.
Claim 21
Dependent Claim
13 words
The foamed article of claim 1, wherein said foamable composition contains a stabilizer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |