US5030676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV light stabilized polyvinyl chloride composition
Assignee: Certainteed LLC
•
Filing: 1989-07-14
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Granted: 1991-07-09
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Expires: 2009-07-14
Abstract
Abstract An improved unplasticized polyvinyl chloride composition for forming articles for exterior use such as house siding and window profiles includes a polymeric organic impact modifier, at least one thermal dehydrochlorination stabilizer, and an ultraviolet stabilization system. The ultraviolet stabilization system includes from about 0.2-15 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and less than about 5 parts by weight of the polyvinyl chloride resin of magnesium oxide. Inclusion of magnesium oxide in the unplasticized polyvinyl chloride composition permits the extrusion of ultraviolet resistant siding and window profiles including relatively low levels of titanium dioxide.
Inventors
- 👤 J. Michael Wallen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/56; C08K5/57; C08K5/58
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
An unplasticized polyvinyl chloride composition for forming articles for exterior use, and of the type having a polymerized or organic impact modifier, the composition comprising polyvinyl chloride resin, at least one thermal dehydrochlorination stabilizer, and an ultraviolet stabilization system, the ultraviolet stabilization system consisting essentially of from about 0.2-15 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and magnesium oxide, the weight ratio of titanium dioxide to magnesium oxide being from about 100:1 to 1:1.
Claim 2
Dependent Claim
79 words
An unplasticized polyvinyl chloride composition for forming articles for exterior use, and of the type having a polymerized or organic impact modifier, the composition comprising polyvinyl chloride resin, at least one thermal dehydrochlorination stabilizer, and an ultraviolet stabilization system, the ultraviolet stabilization system consisting essentially of from about 0.2-15 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and magnesium oxide, the weight ratio of titanium dioxide to magnesium oxide being from about 100:1 to 1:1.
Claim 3
Dependent Claim
30 words
An unplasticized polyvinyl chloride composition according to claim 1 wherein the the ultraviolet stabilization system includes less about 5 parts by weight of the polyvinyl chloride resin of magnesium oxide.
Claim 4
Dependent Claim
48 words
An unplasticized polyvinyl chloride composition according to claim 2 wherein the ultraviolet stabilization system consists essentially of from about 0.5-5 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and less than about 2 parts by weight of the polyvinyl chloride resin of magnesium oxide.
Claim 5
Dependent Claim
24 words
An unplasticized polyvinyl chloride composition according to claim 1 wherein the magnesium oxide has a mean particle size no greater than about 2.2 microns.
Claim 6
Dependent Claim
19 words
An unplasticized polyvinyl chloride composition according to claim 1 wherein the polymeric organic impact modifier is an acrylate derivative.
Claim 7
Dependent Claim
19 words
An unplasticized polyvinyl chloride composition according to claim 1 wherein the thermal dehydrochlorination stabilizer is an organotin sulfur-containing compound.
Claim 8
Dependent Claim
18 words
An unplasticized polyvinyl chloride composition according to claim 6 wherein the organotin sulfur-containing compound is an alkytin mercaptide.
Claim 9
Dependent Claim
17 words
An unplasticized polyvinyl chloride composition according to claim 6 wherein the sulfur-containing compound is an alkyltin thioglycolate.
Claim 10
Dependent Claim
9 words
An article formed from the composition of claim 1.
Claim 11
Dependent Claim
7 words
An extruded article according to claim 9.
Claim 12
Dependent Claim
9 words
Exterior siding formed from the composition of claim 1.
Claim 13
Dependent Claim
23 words
Exterior siding formed using a coextrusion process from at least two polymeric compositions, at least one being a composition according to claim 1.
Claim 14
Dependent Claim
13 words
An extruded component for a window formed from the composition of claim 1.
Claim 15
Dependent Claim
13 words
An extruded component for a doorframe formed from the composition of claim 1.
Claim 16
Dependent Claim
124 words
An unplasticized polyvinyl chloride composition for forming articles for exterior use, and of the type having a polymerized or organic impact modifier, the composition comprising polyvinyl chloride resin, at least one thermal dehydrochlorination stabilizer, and an ultraviolet stabilization system, the ultraviolet stabilization system consisting essentially of from about 0.2-15 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and magnesium oxide, the weight ratio of titanium dioxide to magnesium oxide being from about 100:1 to 1:1, comprising less than about 5 parts by weight of the polyvinyl chloride resin; the magnesium oxide having a mean particle size no greater than bout 2.2 microns; the polymeric organic impact modifier being an acrylate derivative; the thermal dehydrochlorination stabilizer being an organotin sulfur-containing compound.
Claim 17
Dependent Claim
124 words
An unplasticized polyvinyl chloride composition for forming articles for exterior use, and of the type having a polymerized or organic impact modifier, the composition comprising polyvinyl chloride resin, at least one thermal dehydrochlorination stabilizer, and an ultraviolet stabilization system, the ultraviolet stabilization system consisting essentially of from about 0.2-15 parts by weight of the polyvinyl chloride resin of rutile titanium dioxide and magnesium oxide, the weight ratio of titanium dioxide to magnesium oxide being from about 100:1 to 1:1, comprising less than about 5 parts by weight of the polyvinyl chloride resin; the magnesium oxide having a mean particle size no greater than bout 2.2 microns; the polymeric organic impact modifier being an acrylate derivative; the thermal dehydrochlorination stabilizer being an organotin sulfur-containing compound.
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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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |