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Patent US4701472A successfully refreshed from Google Patents.
US4701472A
Expired / Lapsed
US
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Expandable polyvinyl chloride resin composition and foamed sheet prepared from the same
Assignee: Toray Industries Inc
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Filing: 1987-02-24
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Granted: 1987-10-20
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Expires: 2007-02-24
Abstract
Abstract A crosslinked polyvinyl chloride resin composition comprising: A: a polyvinyl chloride resin, B: at least one copolymer selected from the group consisting of ethylene/acrylic acid copolymers, ethylene/alkyl acrylate copolymers and ethylene/alkyl methacrylate copolymers, and C: a polyolefin resin and having a high expansion ratio, and a foam sheet prepared from the composition.
Inventors
- 👤 Mamoru Koebisu
- 👤 Takeshi Nishioka
- 👤 Nario Kamijyukkoku
- 👤 Hirosi Kawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A crosslinked polyvinyl chloride resin foam sheet comprising a resin composition comprising the following resin components A, B and C as indispensable components: A: 30 to 60 wt. % of a polyvinyl chloride resin, B: 15 to 65 wt. % of at least one copolymer selected from the group consisting of ethylene/acrylic acid copolymers, ethylene/alkyl acrylate copolymers and ethylene/alkyl methacrylate copolymers wherein the ethylene content is in the range of about 65 to 90% and the melting point of the copolymer is in the range of about 86° to 102° C.; and C: 5 to 50 wt. % of a polyolefin resin, in a weight ratio of (A+B)/C of at last 1.0 and the integrated ratio (R) in 13 C-NMR spectrum, R=I 56 I 179 ' of the vinyl chloride component to the unsaturated carboxylic acid component is in the range of about 2.0 to 45.
Claim 2
Dependent Claim
146 words
A crosslinked polyvinyl chloride resin foam sheet comprising a resin composition comprising the following resin components A, B and C as indispensable components: A: 30 to 60 wt. % of a polyvinyl chloride resin, B: 15 to 65 wt. % of at least one copolymer selected from the group consisting of ethylene/acrylic acid copolymers, ethylene/alkyl acrylate copolymers and ethylene/alkyl methacrylate copolymers wherein the ethylene content is in the range of about 65 to 90% and the melting point of the copolymer is in the range of about 86° to 102° C.; and C: 5 to 50 wt. % of a polyolefin resin, in a weight ratio of (A+B)/C of at last 1.0 and the integrated ratio (R) in 13 C-NMR spectrum, R=I 56 I 179 ' of the vinyl chloride component to the unsaturated carboxylic acid component is in the range of about 2.0 to 45.
Claim 3
Dependent Claim
40 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1, wherein the amounts of the resin components A, B and C are 40 to 50 wt. %, 20 to 40 wt. % and 10 to 30 wt. %, respectively.
Claim 4
Dependent Claim
46 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1 wherein the resin component B is an ethylene/alkyl acrylate copolymer comprising 10 to 35 wt. % of an alkyl acrylate as the comonomer and having a melt flow rate of 1 to 5 g/10 min.
Claim 5
Dependent Claim
45 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1, wherein the resin component B is an ethylene/acrylic acid copolymer comprising 10 to 35 wt. % of acrylic acid as the comonomer and having a melt flow rate of 1 to 50 g/10 min.
Claim 6
Dependent Claim
20 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1, wherein the resin component C is polyethylene or polypropylene.
Claim 7
Dependent Claim
37 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 5, wherein the polyethylene is a low-density polyethylene having a melting point of lower than 115° C. and a density of up to 0.935 g/cm 3 .
Claim 8
Dependent Claim
79 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 5, wherein the polypropylene is a propylene/α-olefin random copolymer comprising 2 to 8 wt. % of an α-olefin and having a melt flow rate of 0.5 to 10 g/10 min and ratio of absorbance at a wavelength of 730 cm -1 or 720 cm -1 to that at a wavelength of 840 cm -1 [(I 730 /I 840 ) or (I 720 /I 840 )] of 0.02 to 0.3.
Claim 9
Dependent Claim
28 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1, which has an expansion ratio of 5 to 50 and a gel fraction of 15 to 60%.
Claim 10
Dependent Claim
28 words
A crosslinked polyvinyl chloride resin foam sheet according to claim 1, which has an expansion ratio of 10 to 50 and a gel fraction of 20 to 40%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |