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US 6,472,462 B1Granted
Prebinding of fiber materials
AssigneeWacker Chemie AG
InventorsKlaus Kohlhammer, Abdulmajid Hashemzadeh, Claudia Schmidt
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Abstract
This invention relates to a process for prebinding fiber materials by means of a pulverulent binder composition. It further relates to the use of the prebound fiber material for producing plastics moldings from fiber-reinforced unsaturated polyester resins or epoxy resins by laying up the prebound fiber material, saturating the fiber material with the unsaturated polyester resin or epoxy resin and forming the molding.
Claims12
A process for prebinding fiber materials which comprises mixing a pulverulent binder composition comprising
- a) a pulverulent copolymer obtained by emulsion polymerization and subsequent drying, of one or more monomers selected from the group consisting of vinyl esters, acrylic esters, methacrylic esters, vinylaromatics and vinyl chloride and 0.01 to 25% by weight, based on the total weight of the copolymer, of one or more ethylenically unsaturated carboxyl-containing monomers, the interpolymer having a glass transition temperature Tg or a melting point above 35° C., and optionally
- b) at least one pulverulent compound containing at least two reactive groups capable of reaction with the carboxyl groups mentioned under a), and having a melting point of 35° C. to 150° C., and mixing with the fibrous material
- and spreading out the mixture,
- or sprinkling the pulverulent binder on the spread-out fiber material and then binding the fiber material by raising the temperature to 50° C. to 250° C.
1 more element
Dependencies are inferred from the claim text.