Composition of polypropylene having improved tactility and scratch resistance and methods of use thereof

摘要

The present invention provides a polypropylene resin composition in a mixture of a pellet (A) and a pellet (B), which is characterized by mixing them with various inorganic fillers and additives, wherein the pellet (A) comprises a long fiber-reinforced composite resin (a) obtained via a pultrusion impregnation process, and the pellet (B) comprises a composite resin (b) that includes polypropylene and thermoplastic elastomer. The polypropylene resin composition of the present invention can directly replace thermoplastic elastomer overmolding or painting in automotive parts to which such processes are routinely applied (e.g., interior components of the vehicle), which makes it possible to simplify and reduce the cost of the production process for such parts.

主权项

1. A polypropylene resin composition comprising:
a first pellet (A) prepared using a resin composition (A) comprising (a-1) about 22 to about 58 wt % polypropylene resin, wherein said polypropylene resin is selected from the group consisting of polypropylene homopolymer alone or a mixture of polypropylene homopolymer and polypropylene-ethylene copolymers, wherein the polypropylene homopolymer has a pentad ratio (% mmmm) of about 96% or higher, and a limiting viscosity of about 0.7 to about 2.5 dl/g and the polypropylene homopolymer has a melt index of about 10 to about 25 g/10 min at 230° C.; (a-2) about 2 to about 8 wt % modified polypropylene resin; and (a-3) about 40 to about 70 wt % long fibers having a length of about 5 to about 20 mm; and a second pellet (B) prepared using a resin composition (B) comprising (b-1) about 1 to about 5 wt % polypropylene homopolymer; (b-2) about 30 to about 45 wt % polypropylene-ethylene copolymer; (b-3) about 50 to about 65 wt % thermoplastic elastomer; and (b-4) about 0 to about 5 wt % inorganic filler.