Claims
- 1. A process for the production of moldings from unsaturated polyester resins; wherein a storage-stable, non-tacky semi-finished product is first produced, which can thereafter be shaped by any desired method, and finally be cured to give moldings which exhibit no delamination and no white fracture; which comprises the following steps:
- (A) preparing a molding mixture of
- 1. an unsaturated polyester,
- 2. a copolymerizable vinyl compound,
- 3. from 0.005 to 0.5% by weight of an inhibitor,
- 4. from 0.01 to 1% by weight of a photoinitiator,
- 5. from 0.2 to 5% by weight of an oxide or hydroxide of lithium, magnesium or calcium, or of a metal alcoholate, which compounds act as thickeners,
- 6. from 1 to 50% by weight of an aluminum oxide hydrate pulverulent filler which transmits ultraviolet light and/or
- 7. from 5 to 60% by weight of a fibrous reinforcing material, with or without
- 8. other conventional additives, the percentage being based on the total mixture,
- (B) thickening the mixture to give a non-tacky, storage stable semi-finished product,
- (C) shaping the latter, and
- (D) curing it by irradiation with ultraviolet light.
- 2. A process for the production of moldings as claimed in claim 1, wherein, during curing, a zone of the semi-finished product is masked with a film which is opaque to ultraviolet light, thereafter an additional shaping operation is carried out in the masked, non-cured zone, or additional unsaturated polyester material is bonded to this zone, and after rmoving the opaque film the zone is cured.
- 3. A process for the production of moldings as recited in claim 1, wherein the mixture of step (A) comprises both from 1 to 50% by weight of an aluminum oxide hydrate pulverulent filler and from 5 to 60% by weight of a fibrous reinforcing material.
- 4. A process for the production of moldings as recited in claim 1, wherein the mixture of step (A) comprises 5 to 60% by weight of a fibrous reinforcing material, but no aluminum oxide hydrate filler.
- 5. A process for the production of moldings as recited in claim 1, wherein the mixture of step (A) comprises from 1 to 50% by weight of an aluminum oxide hydrate pulverulent filler, but no fibrous reinforcing material.
- 6. A process for the production of moldings as recited in claim 1, wherein the molding mixture is applied to a sheet-like carrier.
- 7. A process for the production of moldings as recited in claim 1, wherein a subsequent heat-treatment is carried out after ultraviolet light curing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2931737 |
Aug 1979 |
DEX |
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Parent Case Info
This is a continuation, of application Ser. No. 163,147 filed June 26, 1980, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2409973 |
May 1974 |
DEX |
2831679 |
May 1979 |
DEX |
1412754 |
Nov 1975 |
GBX |
1422778 |
Jan 1976 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
163147 |
Jun 1980 |
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