Polypropylene molding composition having improved surface properties
AssigneeHoechst Aktiengesellschaft
InventorsMatthias Gutweiler, Hans-Jurgen Zimmermann
Life of this patent
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Abstract
Moldings which have been produced by thermoplastic forming from a polypropylene molding composition which comprises polypropylene or ethylene/propylene copolymers and polyvinyl butyral of the formula ##STR1## have considerable advantages over moldings of a polypropylene molding composition without PVB, since they have a higher surface tension and can therefore be coated, printed on, written on and laminated without problems without further pretreatment of the surface.
Claims12
A polypropylene molding composition comprising 1 to 99% by weight, based on the molding composition, of an isotactic propylene polymer,
- 0 to 60% by weight, based on the molding composition, of a rubber having a glass transition temperature below -20.degree. C.,
- 0.01 to 99% by weight, based on the molding composition, of a polyvinyl butyral and
- 0 to 10% by weight, based on the molding composition, of a phase mediator.
A process for the production of shaped articles which have high surface tension, comprising the steps of:
- making a molding composition by admixing 1-99% by weight of isotactic propylene polymer, 0.01 to 99% by weight polyvinyl butyral, 0 to 60% by weight of a rubber having a glass transition temperature of less than -20.degree. C., and 0-10% by weight of a phase mediator, each based on the molding composition, and
- forming said molding composition into a shaped article, whereby the shaped article thus formed has a surface tension of from about 33 to about 39 mN/m.
A shaped article having high surface tension, which article is formed from a molding composition comprising:
- 1-99% by weight of isotactic propylene polymer,
- 0.01 to 99% by weight polyvinyl butyral,
- 0 to 60% by weight of a rubber having a glass transition temperature of less than -20.degree. C.,
- and 0-10% by weight of a phase mediator, each based on the molding composition, the shaped article thus formed further having a surface tension of from about 33 to about 39 mN/m.
Dependencies are inferred from the claim text.