Use of dendrimers as a processing aid and surface modifiers for thermoplastic resins
AssigneeGeneral Electric Company
InventorVijay R. Mhetar
Life of this patent
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Abstract
Dendrimer additives incorporated in thermoplastic resins (such as polycarbonate resins) are effective to alter the surface characteristics of the thermoplastic resin. Such compositions can be injection molded to produce articles in which the dendrimer additive is concentrated at the surface of the article to alter the properties of the resin. By selection of the type of dendrimer additive, the resulting characteristics of the molded article may be controlled.
Claims25
A composition comprising:
- (a) a thermoplastic resin;
- and
- (b) a dendrimer additive in an amount effective to alter the surface characteristics of the thermoplastic resin.
A molded article formed from a composition comprising:
- (a) a thermoplastic resin;
- and
- (b) a dendrimer additive in an amount effective to alter the surface characteristics of the thermoplastic resin, wherein the molded article has a central region and a surrounding surface region, and wherein the majority of the dendrimer additive is located within the surrounding surface region.
A method for modifying the surface properties of an article formed by injection molding a thermoplastic resin composition, comprising the step of adding to the thermoplastic resin composition prior to injection molding a dendrimer additive in an amount effective to alter the surface characteristics of the thermoplastic resin.
A method for making a molded article comprising the steps of:
- (a) preparing a composition comprising a thermoplastic resin, and a dendrimer additive in an amount effective to alter the surface characteristics of the thermoplastic resin;
- and
- (b) introducing the composition into a mold shaped to form the article, wherein the process of introducing the composition into the mold deforms the material with a large rate of deformation sufficient to produce a molded article having a central region and a surrounding surface region, and wherein the majority of the dendrimer additive is located within the surrounding surface region.
Dependencies are inferred from the claim text.