Patent US4594372A successfully refreshed from Google Patents.
US4594372A
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Polyvinyl chloride composition
Assignee: VISH CHIMIKO-TECHNOLOGITCHESKI INSTITUTE A INSTITUTE OF SOFIA BULGARIA
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Filing: 1984-08-27
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Granted: 1986-06-10
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Expires: 2004-08-27
Abstract
Abstract The invention relates to an improved polyvinyl chloride composition useful in the construction and furniture industries, and particularly for the manufacture of furniture slaps and profiles. The present invention eliminates that activation of the wood meal ingredient with an aqueous solution of resol phenol formaldehyde resin, thereby eliminating a second drying step known to cause defects in the final product, due to gas evolution. In addition, the present invention represents an improvement in appearance and mechanical strength.
Inventors
- 👤 Miltcho A. Natov
- 👤 Stefanka V. Vassileva
- 👤 Hristo B. Kotchev
- 👤 Zvetan S. Djagarov
- 👤 Nikola N. Popov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:23
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L61/00; C08L61/04; C08L61/06; C08L61/14; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
An improved polyvinyl chloride composition containing stabilizers, plasticizers, lubricants, and wood meal, wherein the improvement comprises an addition consisting of novolak phenol formaldehyde resin, hardened by Formalin in the presence of a metallic agent selected from the group consisting of calcium oxide, calcium hydroxide, and magnesium oxide.
Claim 2
Dependent Claim
47 words
An improved polyvinyl chloride composition containing stabilizers, plasticizers, lubricants, and wood meal, wherein the improvement comprises an addition consisting of novolak phenol formaldehyde resin, hardened by Formalin in the presence of a metallic agent selected from the group consisting of calcium oxide, calcium hydroxide, and magnesium oxide.
Claim 3
Dependent Claim
64 words
An improved polyvinyl chloride composition containing, by weight, 100 parts polyvinyl chloride, 1-12 parts stabilizer, 1-75 parts plasticizer, 1-5 parts lubricant, 1-15 parts calcium carbonate, 5-95 parts wood meal of particle size from 5-1000 microns, 0.05-25 parts novolak phenol formaldehyde resin, up to 6 parts Formalin, and 5 parts metallic agent selected from the group consisting of calcium oxide, calcium hydroxide, or magnesium oxide.
Claim 4
Dependent Claim
64 words
An improved polyvinyl chloride composition containing, by weight, 100 parts polyvinyl chloride, 1-12 parts stabilizer, 1-75 parts plasticizer, 1-5 parts lubricant, 1-15 parts calcium carbonate, 5-95 parts wood meal of particle size from 5-1000 microns, 0.05-25 parts novolak phenol formaldehyde resin, up to 6 parts Formalin, and 5 parts metallic agent selected from the group consisting of calcium oxide, calcium hydroxide, or magnesium oxide.
Claim 5
Dependent Claim
18 words
A composition as in claim 2, wherein the particle size of the wood meal ranges from 10-100 microns.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |