US3928254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformly pigmented unsaturated polyester resin molded articles
Assignee: Mitsubishi Chemical Corp
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Filing: 1973-08-03
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Granted: 1975-12-23
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Expires: 1993-08-03
Abstract
Abstract A filler- and fiber-reinforced, uniformly pigmented, unsaturated polyester resin molded article having low profile, which has a structure that unconnected hollow balls having a diameter of 5 to 300 Mu with a wall of styrene polymer containing 0.1 to 6 % by weight of carboxyl group, the wall having a thickness of 1 to 50 Mu , are dispersed in a cured Alpha , Beta -ethylenically unsaturated polyester-styrene copolymer matrix, said styrene polymer having a refractive index less than 0.05 different from that of the copolymer, the total volume of the voids of the hollow balls being 10 to 25 % by volume based on the volume of the copolymer.
Inventors
- 👤 Yuzi Takayama
- 👤 Yutaka Ichimura
- 👤 Takanobu Aoyagi
- 👤 Takahiro Kishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:02
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A FILLER-AND FIBER-REINFORCED, UNIFORMLY PIGMENTED, UNSATURATED POLYESTER RESIN MOLDED ARTICLE HAVING LOW PROFILE, WHICH COMPRISES A STURCTURE IN WHICH UNCONNECTED HOLLOW BALLS HAVING A DIMATER OF 5 TO 300$ WITH A WALL OF A STYRENE POLYMER CONTAINING 0.1 TO 6% BY WEIGHT OF CARBOXYL GROUP, THE WALL HAVING A THICKNESS OF 1 TO 50$, ARE DISPERSED IN A CURED A, B-ETHYLENICALLY UNSATURATED POLYESTER-STYRENE MATRIX, THE AMOUNT OF SAID STYRENE POLYMER BEING 5 TO 30% BY WEIGHT BASED ON THE WEIGHT OF THE TOTAL RESIN COMPONENTS AND THE UNSATURATED POLYESYER-STYRENE COPOLYMER CONSISTING OF 20 TO 80% BY WEIGHT OF UNSATURATED POLYESTER AND 80 TO 20% BY WEIGHT OF STYRENE, SAID STYRENE POLYMER HAVING A REFRACTIVE INDEX LESS THAN 0.05 DIFFERENT FROM THAT OF THE COPOLYMER, THE TOTAL VOLUME OF VOIDS OF THE HOLLOW BALLS BEING 10 TO 25% BY VOLUME BASED ON THE VOLUME OF THE COPOLYMER.
Claim 2
Dependent Claim
146 words
A FILLER-AND FIBER-REINFORCED, UNIFORMLY PIGMENTED, UNSATURATED POLYESTER RESIN MOLDED ARTICLE HAVING LOW PROFILE, WHICH COMPRISES A STURCTURE IN WHICH UNCONNECTED HOLLOW BALLS HAVING A DIMATER OF 5 TO 300$ WITH A WALL OF A STYRENE POLYMER CONTAINING 0.1 TO 6% BY WEIGHT OF CARBOXYL GROUP, THE WALL HAVING A THICKNESS OF 1 TO 50$, ARE DISPERSED IN A CURED A, B-ETHYLENICALLY UNSATURATED POLYESTER-STYRENE MATRIX, THE AMOUNT OF SAID STYRENE POLYMER BEING 5 TO 30% BY WEIGHT BASED ON THE WEIGHT OF THE TOTAL RESIN COMPONENTS AND THE UNSATURATED POLYESYER-STYRENE COPOLYMER CONSISTING OF 20 TO 80% BY WEIGHT OF UNSATURATED POLYESTER AND 80 TO 20% BY WEIGHT OF STYRENE, SAID STYRENE POLYMER HAVING A REFRACTIVE INDEX LESS THAN 0.05 DIFFERENT FROM THAT OF THE COPOLYMER, THE TOTAL VOLUME OF VOIDS OF THE HOLLOW BALLS BEING 10 TO 25% BY VOLUME BASED ON THE VOLUME OF THE COPOLYMER.
Claim 3
Dependent Claim
22 words
A molded article according to claim 1, wherein the styrene polymer is a copolymer of styrene and an aliphatic unsaturated carboxylic acid.
Claim 4
Dependent Claim
25 words
A molded article according to claim 2, wherein the unsaturated carboxylic acid is at least one unsaturated carboxylic acid having 3 to 7 carbon atoms.
Claim 5
Dependent Claim
31 words
A molded article according to claim 1, wherein the pigment is contained in a proportion of 0.1 to 10 parts by weight per 100 parts by weight of the molded article.
Claim 6
Dependent Claim
14 words
A molded article according to claim 1, wherein the fiber is a glass fiber.
Claim 7
Dependent Claim
35 words
A molded article according to claim 1, wherein the unsaturated polyester is a condensate of maleic anhydride and dihydric alcohol or maleic anhydride, a saturated dibasic carboxylic acid or ester-forming equivalent and a dihydric alcohol.
Claim 8
Dependent Claim
53 words
A molded article according to claim 1, wherein the unsaturated polyester is selected from the group consisting of those of isophthalic acid type, bisphenol type, hydrogenated bisphenol type and halogen-containing type, and has an acid number of not more than 15 as measured in the form of a 67 % solution in styrene.
Claim 9
Independent Claim
190 words
A method for producing a filler- and fiber-reinforced, uniformly pigmented, unsaturated polyester molded article, which comprises heating in a mold at a temperature of 120* to 170*C a sheet or bulk molding compound consisting essentially of 15 to 60 parts by weight, per 100 parts by weight of the compound, of a resin solution consisting of 5 to 30% by weight of a styrene polymer containing 0.1 to 6% by weight of carboxyl group, and, as the remainder of said solution, an Alpha , Beta -ethylenically unsaturated polyester and styrene monomer in relative amounts of 20 to 80% by weight of said Alpha , Beta -ethylenically unsaturated polyester and 80 to 20% by weight of said styrene monomer; a filler; a reinforcing fiber; a thickening agent; and a pigment to cure the resin solution, thereby forming a structure in which unconnected hollow balls having a diameter of 5 to 300 Mu with a wall of a styrene polymer are dispersed in a cured Alpha , Beta -ethylenically unsaturated polyester-styrene copolymer matrix, the total voids of hollow balls being 10 to 25% by volume based on the volume of the copolymer.
Claim 10
Independent Claim
190 words
A method for producing a filler- and fiber-reinforced, uniformly pigmented, unsaturated polyester molded article, which comprises heating in a mold at a temperature of 120* to 170*C a sheet or bulk molding compound consisting essentially of 15 to 60 parts by weight, per 100 parts by weight of the compound, of a resin solution consisting of 5 to 30% by weight of a styrene polymer containing 0.1 to 6% by weight of carboxyl group, and, as the remainder of said solution, an Alpha , Beta -ethylenically unsaturated polyester and styrene monomer in relative amounts of 20 to 80% by weight of said Alpha , Beta -ethylenically unsaturated polyester and 80 to 20% by weight of said styrene monomer; a filler; a reinforcing fiber; a thickening agent; and a pigment to cure the resin solution, thereby forming a structure in which unconnected hollow balls having a diameter of 5 to 300 Mu with a wall of a styrene polymer are dispersed in a cured Alpha , Beta -ethylenically unsaturated polyester-styrene copolymer matrix, the total voids of hollow balls being 10 to 25% by volume based on the volume of the copolymer.
Claim 11
Dependent Claim
25 words
A method according to claim 8, wherein the styrene polymer has a reducEd viscosity of 0.30 to 0.45 dl/g as measured in dimethylformamide at 25*C.
Claim 12
Dependent Claim
30 words
A method according to claim 8, wherein the thickening agent is contained in an amount of 0.02 to 5 parts by weight per 100 parts by weight of the 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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |