Patent US4439559A successfully refreshed from Google Patents.
US4439559A
Expired / Lapsed
US
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Moulding compositions
Assignee: Scott Bader Co Ltd
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Filing: 1982-09-23
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Granted: 1984-03-27
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Expires: 2002-09-23
Abstract
Abstract A polyester moulding composition for providing a moulded article less susceptible to cracking than those made from conventional polyester moulding compositions contains an unsaturated polyester resin, 25-55 mole % of the acid of which is a symmetrical aromatic saturated dicarboxylic acid and the glycol of which is preferably 1,6 - hexanediol, a monomer which is a solid or liquid of low volatility, at least one inorganic filler and reinforcing fibres. The filler preferably has a mean particle size of below 5μ or from 15 to 130μ inclusive.
Inventors
- 👤 Trevor R. Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A granular composition for moulding, which composition contains (a) an unsaturated polyester resin, 25-55 mole % of the acid component of which is a symmetrical aromatic saturated dicarboxylic acid and the glycol component of which is 1,6-hexanediol, (b) a monomer which is selected from monomers which are solids and liquids of low volatility, (c) at least one inorganic filler, and (d) reinforcing fibres.
Claim 2
Dependent Claim
63 words
A granular composition for moulding, which composition contains (a) an unsaturated polyester resin, 25-55 mole % of the acid component of which is a symmetrical aromatic saturated dicarboxylic acid and the glycol component of which is 1,6-hexanediol, (b) a monomer which is selected from monomers which are solids and liquids of low volatility, (c) at least one inorganic filler, and (d) reinforcing fibres.
Claim 3
Dependent Claim
13 words
A composition according to claim 1, wherein the remaining acid is fumaric acid.
Claim 4
Dependent Claim
21 words
A composition according to claim 1, wherein 30-50 mole % of the acid is a said symmetrical aromatic saturated dicarboxylic acid.
Claim 5
Dependent Claim
19 words
A composition according to claim 1, wherein the symmetrical aromatic dicarboxylic acid is selected from terephthalic acid and 4,4-dicarboxydiphenyl.
Claim 6
Dependent Claim
31 words
A composition according to claim 1, wherein the said at least one filler has a mean particle size selected from the ranges of below 5μ and from 15 to 130μ inclusive.
Claim 7
Dependent Claim
23 words
A composition according to claim 1, wherein the amount of filler is from 60-70% by weight of the total weight of the composition.
Claim 8
Dependent Claim
15 words
A composition according to claim 1, wherein the monomer is a liquid of low volatility.
Claim 9
Dependent Claim
22 words
A composition according to claim 7, wherein the monomer is selected from the group consisting of diallyl phthalate and methylene bis acrylamide.
Claim 10
Dependent Claim
16 words
A composition according to claim 1, which additionally contains dicumyl peroxide as a free radical catalyst.
References Cited (Backward Citations)
GB823755A
Cited
GB993378A
Cited
DE1469895A1
Cited
US3652489A
Cited
US3692736A
Cited
GB1318517A
Cited
GB1319243A
Cited
US3632667A
Cited
US3631224A
Cited
FR2329712A1
Cited
US4077939A
Cited
GB2044282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |