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US3972977A
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US
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Moulding process for unsaturated polyester resins containing filler material
Assignee: FREEMAN CHEMICALS Ltd 5 CIVIC WAY ELLESMERE PORT SOUTH WIRRAL L65 4AH
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Filing: 1972-04-05
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Granted: 1976-08-03
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Expires: 1992-04-05
Abstract
Abstract A process for the preparation of moulded articles by the compression moulding at elevated temperatures in matched metal moulds of moulding compounds based on thermosettable unsaturated polyester resins, where at least one of the filler materials in the moulding compounds has a particle diameter greater than the width of flash channel of the mould used in order to enable moulded articles of improved surface finish to be produced.
Inventors
- 👤 David Philip Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:46
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
In a process for the preparation of a moulded article by subjecting a moulding composition to the action of heat and pressure in a matched metal mould having a flash channel, the improvement which consists of the use as the moulding composition of a material comprising an unsaturated polyester, an ethylenically unsaturated monomer copolymerisable therewith, a fibrous reinforcing filler and a primary particulate inorganic filler of particle diameter greater than the width of the flash channel of the mould, said primary particulate inorganic filler being present in an amount greater than 6.0% by weight of the total moulding composition and sufficient to improve the surface finish of the moulded article.
Claim 2
Dependent Claim
110 words
In a process for the preparation of a moulded article by subjecting a moulding composition to the action of heat and pressure in a matched metal mould having a flash channel, the improvement which consists of the use as the moulding composition of a material comprising an unsaturated polyester, an ethylenically unsaturated monomer copolymerisable therewith, a fibrous reinforcing filler and a primary particulate inorganic filler of particle diameter greater than the width of the flash channel of the mould, said primary particulate inorganic filler being present in an amount greater than 6.0% by weight of the total moulding composition and sufficient to improve the surface finish of the moulded article.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 wherein the unsaturated polyester has a major proportion of maleic or fumaric unsaturation.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 wherein a minor proportion of the maleic or fumaric residues in the unsaturated polyester are replaced by isophthalic, carbic, tetrachlorophthalic or chlorendic acid residues.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1 wherein the copolymerisable monomer is styrene, diallyl phthalate, vinyl toluene or triallyl cyanurate.
Claim 6
Dependent Claim
34 words
A process as claimed in claim 4 wherein the copolymerisable monomer is present in an amount in the range 10 to 60% by weight of the total weight of unsaturated polyester and copolymerisable monomer.
Claim 7
Dependent Claim
33 words
A process as claimed in claim 1 wherein the unsaturated polyester and the copolymerisable monomer are present in an amount in the range 20 to 35% by weight of the total moulding composition.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 1 wherein the fibrous reinforcing filler is glass, sisal, asbestos, terylene and polyvinyl alcohol fibres.
Claim 9
Dependent Claim
28 words
A process as claimed in claim 7 wherein the fibrous reinforcing filler is present in an amount from 15 to 35% by weight of the total moulding composition.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 1 wherein the primary particulate filler is glass, alumina, a silicate calcium carbonate, dolomite or mixtures thereof.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 9 wherein the primary particulate filler comprises substantially spherical glass beads.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 9 wherein the primary particulate filler comprises a cubic or rectangular glass beads.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 1 wherein the diameter of the primary particulate filler is greater than 5 × 10 - 3 inches.
Claim 14
Dependent Claim
29 words
A process as claimed in claim 1 wherein the primary particulate filler is present in an amount in the range 10 to 20% by weight of the total composition.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 1 wherein the moulding composition contains up to 50% by weight of a secondary particulate inorganic filler.
Claim 16
Dependent Claim
23 words
A process as claimed in claim 14 wherein part of the secondary inorganic filler is replaced by an organic mould shrinkage control system.
Claim 17
Dependent Claim
35 words
A process as claimed in claim 1 wherein the moulding is carried out at pressures in the range 500 to 800 pounds per square inch and mould temperatures in the range 120° to 140° C.
Claim 18
Dependent Claim
31 words
A process as claimed in claim 1 wherein the matched metal mould used has a flash channel whose width is in the range 3 to 5 × 10 - 3 inches.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |