Cross-linked polycarbonate resin with improved chemical and flame resistance
AssigneeSabic Global Technologies B.V.
InventorsJean-Francois Morizur, Paul Dean Sybert
Life of this patent
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Abstract
Disclosed herein are processes for preparing articles from compositions including a cross-linked polycarbonate. The cross-linked polycarbonate may be derived from a polycarbonate having about 0.5 mol % to about 5 mol % endcap groups derived from a monohydroxybenzophenone. The article is molded, then exposed to UV radiation. A plaque including the composition can achieve a UL94 5VA rating.
Claims33
A process for preparing an article having improved flame retardance, comprising:
- (a) providing a composition comprising (i) a non-cross-linked polycarbonate comprising about 0.5 mol % to about 5 mol % endcap groups that are derived from a monohydroxybenzophenone and all other endcaps being derived from phenol, p-cumylphenol, or p-tertiary-butylphenol, and (ii) a flame retardant;
- (b) molding the composition of step (a) into an article, or coating an article with the composition of step (a);
- and
- (c) exposing the molded article or coated article of step (b) to UV-radiation by passing the article through a UV-chamber to affect cross-linking of the non-cross-linked polycarbonate;
- wherein a plaque formed from the composition achieves a UL 94 5VA rating at a thickness of 3.0 mm±10% or less after UV exposure.
A process for preparing an article having improved flame retardance, comprising:
- (a) providing a composition comprising (i) a non-cross-linked polycarbonate comprising about 0.5 mol % to about 5 mol % endcap groups, wherein all endcap groups are derived from a monohydroxybenzophenone, and (ii) a flame retardant;
- (b) molding the composition of step (a) into an article, or coating an article with the composition of step (a);
- and
- (c) exposing the molded article or coated article of step (b) to UV-radiation for 90 seconds in a UV-chamber, providing an energy of irradiation of 3,000 mJ/cm2, to affect cross-linking of the non-cross-linked polycarbonate;
- wherein a plaque formed from the composition achieves a UL 94 5VA rating at a thickness of 3.0 mm±10% or less after UV exposure.
A process for preparing an article with improved flame retardance, comprising:
- (a) providing a composition comprising (i) a non-cross-linked polycarbonate having endcap groups, wherein the endcap groups consist of about 0.5 mol % to about 5 mol % endcap groups derived from a monohydroxybenzophenone, and (ii) a flame retardant;
- (b) molding the composition of step (a) into an article, or coating an article with the composition of step (a), using extrusion processes, multilayer extrusion processes, and combinations thereof;
- and
- (c) exposing the molded article or coated article of step (b) to UV-radiation in a UV-chamber to affect cross-linking of the non-cross-linked polycarbonate;
- wherein a plaque formed from the composition achieves a UL 94 5VA rating at a thickness of 3.0 mm±10% or less after UV exposure.
A process for preparing an article with improved flame retardance, comprising:
- (a) providing a composition comprising (i) a non-cross-linked polycarbonate comprising about 0.5 mol % to about 5 mol % endcap groups, wherein all endcap groups are derived from 2 hydroxybenzophenone, 3-hydroxybenzophenone, or 4-hydroxybenzophenone, and (ii) a flame retardant;
- (b) molding the composition of step (a) into an article, or coating an article with the composition of step (a);
- and
- (c) exposing the molded article or coated article of step (b) to UV-radiation in a UV-chamber to affect cross-linking of the non-cross-linked polycarbonate;
- wherein a plaque formed from the composition achieves a UL 94 5VA rating at a thickness of 3.0 mm±10% or less after UV exposure;
- and
- wherein the molded article and/or coated article of step (b) includes a multilayer sheet or multilayer film, wherein the composition is present in at least one of the outer layers.
Dependencies are inferred from the claim text.