Production of moldings from unsaturated polyester resins
AssigneeBASF SE
InventorsAnton Hesse, Dankmar Scholz, Walter Nicolaus
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Abstract
A process for the production of moldings from unsaturated polyester resins wherein a mixture is first prepared from 1. an unsaturated polyester, 2. a copolymerizable vinyl compound, 3. an inhibitor, 4. a photoinitiator, 5. a thickener, preferably MgO, 6. a pulverulent auxiliary which transmits ultraviolet light and/or 7. a fibrous reinforcing material and 8. further conventional additives. This mixture is thickened, where appropriate after coating onto a sheet-like carrier, to form a semi-finished product, which is then finally shaped, and cured by UV irradiation after which it may or may not be heat-treated.
Claims7
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.
Dependencies are inferred from the claim text.