Patent US4751261A successfully refreshed from Google Patents.
US4751261A
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Stabilized polyvinyl chloride resin composition
Assignee: Kyowa Chemical Industry Co Ltd
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Filing: 1987-08-13
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Granted: 1988-06-14
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Expires: 2007-08-13
Abstract
Abstract Magnesium oxide is incorporated into a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite, a beta -diketone compound and an organic acid salt of zinc or a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite and an organic tin compound. Bubbling as well as discoloration can be prevented in a molded article prepared from the polyvinyl chloride resin composition. Magnesium oxide having a specific surface area of at least 50 m2/g and an average secondary particle size smaller than 5 mu m is preferably used.
Inventors
- 👤 Shigeo Miyata
- 👤 Tsutomu Nosu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:58
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; C08K13/00; C08K13/02; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K5/04; C08K5/07; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A stabilized polyvinyl chloride resin composition comprising 100 parts by weight of a polyvinyl chloride resin and, incorporated therein, (a) 0.05 to 10 parts by weight of a hydrotalcite, (b) 0.01 to 5 parts by weight of magnesium oxide, (c) 0.01 to 5 parts by weight of a β-diketone compound and (d) 0.01 to 5 parts by weight of an organic acid salt of zinc.
Claim 2
Dependent Claim
65 words
A stabilized polyvinyl chloride resin composition comprising 100 parts by weight of a polyvinyl chloride resin and, incorporated therein, (a) 0.05 to 10 parts by weight of a hydrotalcite, (b) 0.01 to 5 parts by weight of magnesium oxide, (c) 0.01 to 5 parts by weight of a β-diketone compound and (d) 0.01 to 5 parts by weight of an organic acid salt of zinc.
Claim 3
Dependent Claim
38 words
A stabilized polyvinyl chloride resin composition as set forth in claim 1, wherein the magnesium oxide has a specific surface area of at least 50 m 2 /g and an average secondary particle size smaller than 5 μm.
Claim 4
Dependent Claim
70 words
A stabilized polyvinyl chloride resin composition as set forth in claim 1, wherein the hydrotalcite has a composition represented by the following formula (1): M.sup.2+.sub.1-x Al.sub.x (OH).sub.2 A.sup.n-.sub.x/n.mH.sub.2 O (1) wherein M 2+ stands for Mg or a solid solution of Mg and Zn, A n- stands for an anion having a valency of n, x is a positive number of 0-x<0.5, and m is a positive number of 0≦m<1.
Claim 5
Dependent Claim
52 words
A stabilized polyvinyl chloride resin composition comprising 100 parts by weight of a polyvinyl chloride resin and, incorporated therein, (a) 0.05 to 10 parts by weight of a hydrotalcite, (b) 0.01 to 5 parts by weight of magnesium oxide and (c) 0.01 to 5 parts by weight of an organic tin compound.
Claim 6
Dependent Claim
52 words
A stabilized polyvinyl chloride resin composition comprising 100 parts by weight of a polyvinyl chloride resin and, incorporated therein, (a) 0.05 to 10 parts by weight of a hydrotalcite, (b) 0.01 to 5 parts by weight of magnesium oxide and (c) 0.01 to 5 parts by weight of an organic tin compound.
Claim 7
Dependent Claim
38 words
A stabilized polyvinyl chloride resin composition as set forth in claim 4, wherein the magnesium oxide has a specific surface area of at least 50 m 2 /g and an average secondary particle size smaller than 5 μm.
Claim 8
Dependent Claim
70 words
A stabilized polyvinyl chloride resin composition as set forth in claim 4, wherein the hydrotalcite has a composition represented by the following formula (1): M.sup.2+.sub.1-x Al.sub.x (OH).sub.2 A.sup.n-.sub.x/n.mH.sub.2 O (1) wherein M 2+ stands for Mg or a solid solution of Mg and Zn, A n- stands for an anion having a valency of n, x is a positive number of 0<x<0.5, and m is a positive number of 0≦m<1.
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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |