US 7,732,520 B2 · Resin composition

Abstract

It is an object of the present invention that a resin composition which has high chemical resistance while retaining high fluidity, is excellent in impact resistance, heat resistance, stiffness and heat stability and comprises an aromatic polycarbonate and polyethylene terephthalate, a molded product thereof and a process of manufacturing a car exterior material. This invention provides the resin composition which comprises 50 to 100 wt % of a resin component and 0 to 50 wt % of an inorganic filler (component D), wherein the resin component is composed of (i) an aromatic polycarbonate (component A) having a specific viscosity average molecular weight and (ii) polyethylene terephthalate (component B) having a specific intrinsic viscosity (IV), a specific terminal carboxyl group content and a specific ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn), and (iii) the weight ratio {(A+D)/B} of the total of the components A and D to the component B is 60/40 to 85/15, and a molded product thereof and a process of manufacturing a car exterior material.

Claims25

Dependent claims

A resin composition comprising 50 to 100 wt % of a resin component and 0 to 50 wt % of an inorganic filler (component D), wherein

the resin component is composed of (i) an aromatic polycarbonate (component A) having a viscosity average molecular weight of 16,000 to 23,000 and (ii) polyethylene terephthalate (component B) having an intrinsic viscosity (IV) of 0.45 to 0.57 dl/g, a terminal carboxyl group content of 20 to 35 eq/ton and a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 1.3 to 2.1, and (iii) the weight ratio {(A+D)/B} of the total of the components A and D to the component B is 60/40 to 85/15.

A process of manufacturing a car exterior material by injection molding a resin composition in a mold, wherein

(i) the mold has (i-1) a gate-A and a gate-B, (i-2) the gate-B is supplied with a molten resin so that it joins a flow of a molten resin flowing in from another gate after the flow passes and the gate-A is supplied with a molten resin without joining the flow of the molten resin, and (i-3) the gates in the mold are each installed in an area having a linear distance of at least 20 cm on the surface of the exterior material where other gates are not existent;
(ii) the car exterior material is mainly composed of (ii-1) a design surface on any one of the front and rear surfaces and a portion which does not require a design and is selected from the group consisting of a recess from the design surface and a through portion having no surface;
and
(iii) the resin composition comprises (iii-1) 50 to 100 wt % of a resin component and 0 to 50 wt % of an inorganic filler (component D), the resin component is composed of (iii-2) an aromatic polycarbonate (component A) having a viscosity average molecular weight of 16,000 to 23,000 and (iii-3) polyethylene terephthalate (component B) having an intrinsic viscosity (IV) of 0.45 to 0.57 dl/g, a terminal carboxyl group content of 20 to 35 eq/ton and a ratio (Mw/Mn) of weight average molecular weight to number average molecular weight of 1.3 to 2.1, and (iii-4) the weight ratio {(A+D)/B} of the total of the components A and D to the component B is 60/40 to 85/15.

1 more element

Dependencies are inferred from the claim text.

Resin composition

Life of this patent

Resin composition

Life of this patent

Abstract

Claims25