# US 5,705,538 A · Composition for obtaining foamed polyvinylchloride material and method of obtaining it

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- Number: US 5,705,538 A
- Document ID: US5705538A
- Status: Granted
- Kind: A
- Application number: 08/382,027
- Filed: 1995-04-03
- Granted: 1998-01-06
- Earliest claimed: 1992-08-11
- Assignees: Polimerplast
- Inventors: Igor Victorovich Morozov; Lyubov Dmitrievna Strelkova; Yuliya Vladimirovna Razborova; Pyotr Mikhailovich Traskin; German Valeryevich Gordeyev; Valery Innokentyevich Yemelyanov; Valery Iosifovich Kharitonov; Anatoly Fyodorovich Perevalov; Vladimir Yevgenyevich Popov; Vyacheclav Nikolayevich Kovalev
- Web page: https://patentgrep.com/patent/US5705538A

## CPC

- C08J 9/24: by surface fusion and bonding of particles to form voids, e.g. sintering (of expandable particles C08J9/232)
- C08J 9/0033: {containing sulfur}
- C08K 5/42: Sulfonic acids; Derivatives thereof
- C08J 2327/06: Homopolymers or copolymers of vinyl chloride
- Y10S 521/919: Sintered product
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A foamed polyvinylchloride (PVC) material is produced by mixing of 100 mass parts of PVC with 0.5-5 mass parts of sodium alkyl sulfonate, molding of the obtained composition and followed by heating for foaming at 190.degree.-300.degree. C. for 3-20 mins. Molding is performed either under 0.5-400 MPa and 20.degree.-170.degree. C., followed by heating to 140.degree.-150.degree. C. in the closed space, or in a free state in the form of 2-16 mm thickness layer. In the latter case the layer before foaming can be subjected to packing.

## Claims

### Claim 1

A process for the foamed polyvinylchloride production, which comprises mixing of powder polyvinylchloride with a polar compound additive, molding of the mixture and the following heating, characterized in that suspension or mass polyvinylchloride is mixed with sodium alkyl sulfonate, taken in amount of 0.5-5 mass parts per 100 mass parts of polyvinylchloride, is molded and is heated in a free state at 190.degree.-300.degree. C. for 3-20 mins.

### Claim 2 (depends on 1)

A process as claimed in claim 1, characterized in that the composition is molded under the pressure of 0.5-400 MPa and the temperature of 20.degree.-170.degree. C. to achieve density of 0.72-1.28 g/cu.cm, and before heating in a free state it is heated in the closed space to 140.degree.-150.degree. C.

### Claim 3 (depends on 1)

A process as claimed in claim 1, characterized in that the composition is molded in a free state in the form of 2-16 mm thickness layer.

### Claim 4 (depends on 3)

A process as claimed in claim 3, characterized in that the layer of the mixture after its formation is being packed.