US 2001/0025067 A1Published application

Method for on-mold coating molded articles with a coating powder as a liquid gel coat replacement

OwnerEdward G. Nicholl, Navin B. Shahinventors

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Abstract

Method for on-mold surface coating fiberglass-reinforced molded articles during their manufacture with environmentally friendly and physiologically safe thermosetting unsaturated polyester on-mold coating powders which serve as replacements for liquid gel coats. The thermosetting coating powders employed are adapted to cure at low temperatures to avoid causing thermal damage to the heat sensitive plastic molds which must be reused over and over again, and to cure in the presence of atmospheric oxygen to enable over coating with liquid fill resins and fiberglass, which constitute the bulk of the finished article, without having the fill resins bleed through the powder coating film and detrimentally affect the overall quality of the surface finish.

Claims19

Dependent claims

A method for on-mold coating a molded article in an open mold, comprising:

a) providing a thermosetting unsaturated polyester coating powder composition which consists essentially of an unsaturated polyester resin, a copolymerizable cross-linking prepolymer, and a thermal initiator, with the proviso that the composition is essentially free of a copolymerizable cross-linking monomer;
b) applying said coating powder composition, which becomes the outer skin of the molded article, onto a shape-imparting mold surface;
c) heating said powder coated mold surface to a temperature sufficient to flow and coalesce the coating powder into a substantially continuous coating film and effect cure, with the temperature being below the mold deformation temperature;
e) applying a fill resin, which constitutes the bulk of the molded article, onto said cured powder coating and allowing the cure of the fill resin to advance sufficiently until said powder coating film and fill resin are integral;
and,
g) releasing said finished coated article from said mold.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/810,718Filed 16 Mar 2001
Priority: 8 Apr 1999
Published: 27 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B29C 37/0032
In-mould coating, e.g. by introducing the coating material into the mould after forming the article: the coating being applied upon the mould…
B29K 2067/00
Use of polyesters or derivatives thereof, as moulding material
Y10T 428/31794
Of polyester [e.g., alkyd, etc.]: of cross-linked polyester
B29C
Shaping or joining of plastics

Family

Application09/288,765Division · filed 8 Apr 1999
Application09/810,718Division · filed 16 Mar 2001
US 6,235,228 B1Related patent
US 2001/0025067 A1This patent

From the US filing history. Foreign family members aren’t listed.

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