US4048138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of talc-filled polystyrene
Assignee: CELITE Corp A CORP OF DELAWARE
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Filing: 1976-07-19
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Granted: 1977-09-13
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Expires: 1996-07-19
Abstract
Abstract A talc-filled polystyrene composition which is stabilized against short-term color degradation is described. The composition comprises polystyrene, talc, and a polyester-forming mixture of a polybasic organic acid or anhydride, preferably trimellitic anhydride, and a polyhydric alcohol, preferably a polyethylene glycol.
Inventors
- 👤 Christian John Miga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:47
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K5/00; C08K5/04; C08K5/05; C08K5/09; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A polystyrene composition filled with at least 20% by weight of talc and stabilized against short-term color degradation, which comprises, in parts by weight: ______________________________________
polystyrene 25 to 80 parts
talc 20 to 75 parts
______________________________________ and 0.5 to 5 parts of a mixture of polyester forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250° to 550° F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
Claim 2
Dependent Claim
105 words
A polystyrene composition filled with at least 20% by weight of talc and stabilized against short-term color degradation, which comprises, in parts by weight: ______________________________________
polystyrene 25 to 80 parts
talc 20 to 75 parts
______________________________________ and 0.5 to 5 parts of a mixture of polyester forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250° to 550° F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
Claim 3
Dependent Claim
26 words
A composition as in claim 1 wherein said organic acid or anhydride and said alcohol are present in approximately equal parts by weight in said mixture.
Claim 4
Dependent Claim
30 words
A composition as in claim 1 wherein said polystyrene is present as 50 to 80 parts by weight and said talc is present as 20 to 50 parts by weight.
Claim 5
Dependent Claim
30 words
A composition as in claim 1 wherein said polystyrene is present as 25 to 50 parts by weight and said talc is present as 50 to 75 parts by weight.
Claim 6
Dependent Claim
28 words
A composition as in claim 1 wherein said organic acid or anhydride is selected from the group consisting of phthalic and terephthalic acids and anhydrides and trimellitic anhydride.
Claim 7
Dependent Claim
13 words
A composition as in claim 5 wherein said organic anhydride is trimellitic anhydride.
Claim 8
Dependent Claim
24 words
A composition as in claim 1 wherein said polyhydric alcohol is selected from the group consisting of pentaerythritol, dipentaerythritol, hexahydric alcohols and polyethylene glycols.
Claim 9
Dependent Claim
14 words
A composition as in claim 7 wherein said polyhydric alcohol is a polyethylene glycol.
Claim 10
Dependent Claim
87 words
A filler composition for highly filled polystyrene which comprises, in parts by weight, 25 to 80 parts of talc and 0.5 to 5 parts of a mixture of polyester-forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250° to 550° F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
Claim 11
Dependent Claim
87 words
A filler composition for highly filled polystyrene which comprises, in parts by weight, 25 to 80 parts of talc and 0.5 to 5 parts of a mixture of polyester-forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250° to 550° F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
Claim 12
Dependent Claim
24 words
A composition as in claim 9 wherein said organic acid or anhydride and said alcohol are present in approximately equal weights in said mixture.
Claim 13
Dependent Claim
13 words
A composition as in claim 9 wherein said organic anhydride in trimellitic anhydride.
Claim 14
Dependent Claim
13 words
A composition as in claim 9 wherein said alcohol is a polyethylene glycol.
References Cited (Backward Citations)
US3553158A
Cited
US3799906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |