Patent application EP19183241A (EP), filed 2019-06-28
Publication number: EP3757158A1
Title: REINFORCED POLYCARBONATE COMPOSITIONS WITH IMPROVED HEAT RESISTANCE
Abstract: A reinforced polycarbonate composition includes 30-60 wt% of a homopolycarbonate; 5-30 wt% of a poly(carbonate-siloxane); 10-40 wt% of a high heat polycarbonate having a glass transition temperature of 170°C or higher; 1-10 wt% of a phosphorus-containing flame retardant present in amount effective to provide 0.1-1.5 wt% phosphorous; 0.01-0.5 wt% of an anti-drip agent; 5-30 wt% of a reinforcing fiber; and optionally, up to 10 wt% of an additive composition, wherein each amount is based on the total weight of the reinforced polycarbonate composition, which sums to 100 wt%. A molded sample of the polycarbonate composition has a heat deflection temperature greater than 115°C, preferably greater than 125°C, more preferably greater than 130°C, or a flame test rating of V1, preferably V0 as measured according to UL-94 at a thickness of 0.8 millimeter, or at a thickness of 0.6 mm, or at a thickness of 0.4 mm.
IPC codes: C08K   3/    00            A I
C08K   5/    36            A I
C08K   5/    41            A I
C08L  69/    00            A I
C09K  21/    14            A I
Claims: number: 1
text: A reinforced polycarbonate composition comprising
30-60 weight percent of a homopolycarbonate;
5-30 weight percent of a poly(carbonate-siloxane), preferably present in an amount effective to provide 2-6 weight percent of siloxane;
10-40 weight percent of a high heat polycarbonate having a glass transition temperature of 170°C or higher;
1-10 weight percent of a phosphorus-containing flame retardant present in amount effective to provide 0.1-1.5 weight percent phosphorous;
0.01-0.5 weight percent of an anti-drip agent;
5-30 weight percent of a reinforcing fiber; and
optionally, up to 10 weight percent of an additive composition,
wherein each amount is based on the total weight of the reinforced polycarbonate composition, which sums to 100 weight percent; and
wherein a molded sample of the polycarbonate composition has
number: 2
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein the reinforced polycarbonate composition comprises
30-60 weight percent of the homopolycarbonate;
5-20 weight percent of the poly(carbonate-siloxane), present in an amount effective to provide 2-4 weight percent of dimethyl siloxane;
15-35 weight percent of the high heat polycarbonate;
2-8 weight percent of the flame retardant, wherein the flame retardant is preferably an oligomeric phosphate, a phosphazene, or a combination thereof, present in amount effective to provide 0.4-1.0 weight percent phosphorous;
0.01-0.5 weight percent of a polytetrafluoroethylene or an encapsulated polytetrafluoroethylene as an anti-drip agent; and
5-30 weight percent of the reinforcing fiber, preferably glass fibers;
wherein each amount is based on the total weight of the reinforced polycarbonate composition, which sums to 100 weight percent; and
wherein a molded sample of the polycarbonate composition has
number: 3
text: The reinforced polycarbonate composition of claim 1, wherein the homopolycarbonate comprises
number: 4
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein the poly(carbonate-siloxane) comprises 50-99 weight percent of bisphenol A carbonate units and 1-50 weight percent of dimethylsiloxane units, each based on the weight of the poly(carbonate-siloxane)
preferably wherein the poly(carbonate-siloxane) comprises siloxane units of the formula
number: 5
text: The reinforced polycarbonate composition of any one or more of the preceding claims,
wherein the high heat polycarbonate comprises a poly(ester-carbonate) comprising aromatic carbonate units, preferably bisphenol A carbonate units, and aromatic ester units derived from bisphenol A.
number: 6
text: The reinforced polycarbonate composition of any one or more of the preceding claims,
wherein the high heat polycarbonate comprises high heat aromatic carbonate units derived from 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethyl-cyclohexane, N-phenyl phenolphthalein bisphenol, 4,4'-(1-phenylethylidene)bisphenol, 4,4'-(3,3-dimethyl-2,2-dihydro-1H-indene-1,1-diyl)diphenol, 1,1-bis(4-hydroxyphenyl)cyclododecane, 3,8-dihydroxy-5a,10b-diphenyl-coumarano-2',3',2,3-coumarane, or a combination thereof, preferably 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethyl-cyclohexane, N-phenyl phenolphthalein bisphenol, or a combination thereof; and
optionally, low heat aromatic carbonate units, preferably bisphenol A carbonate units.
number: 7
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein the flame retardant is of the formula
number: 8
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein
the flame retardant is of the formula
number: 9
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein the flame retardant is a phosphazene is of formulas
number: 10
text: The reinforced polycarbonate composition of any one or more of the preceding claims, wherein
the flame retardant is a phenoxy cyclotriphosphazene, octaphenoxy cyclotetraphosphazene, decaphenoxy cyclopentaphosphazene, or a combination thereof; and
the flame retardant is present in an amount effective to provide 0.5 to 1.0 weight percent of phosphorus; and
a molded sample of the composition has
number: 11
text: The composition of any one or more of the preceding claims, wherein a molded sample of the polycarbonate composition has
a Vicat B120 softening temperature of at least 130°C as measured according to ISO 306, or
a notched Izod impact strength of greater than or equal to 8 kiloJoule per square meter as measured at 23°C according to ISO 180/1 A, or
a bromine or chlorine content of less than or equal to 100 parts per million by weight, or
a total bromine and chlorine content of less than or equal to 100 parts per million by weight, or
a combination thereof.
number: 12
text: An article of any one or more of the preceding claims, wherein the article is an extruded article, a molded article, pultruded article, a thermoformed article, a foamed article, a layer of a multi-layer article, a substrate for a coated article, or a substrate for a metallized article, preferably wherein the article is a molded article.
number: 13
text: The article of claim 12, wherein the article is a molded housing for electrical components.
number: 14
text: The article of claim 12 or 13, wherein the article is an electrical circuit housing.
number: 15
text: A method for forming the article of any one or more of the preceding claims, comprising molding, casting, or extruding the article.
Office action: search_report, dated 2020-12-30
Rejection reasons: novelty_epc_54
Prior art cited: ref_id: WO2013175448A1
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severity: background
ref_id: - H. R. ALLCOOK: "Phosphorus-Nitrogen Compounds", 1972, ACADEMIC PRESS
ref_type: npl
severity: background
ref_id: - J. E. MARK ET AL.: "Inorganic Polymers", 1992, PRENTICE-HALL INTERNATIONAL, INC.
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severity: background
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severity: background
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severity: background
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severity: background
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ref_type: patent
severity: background
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ref_type: patent
severity: novelty_destroying
ref_id: US2013317142
ref_type: patent
severity: novelty_destroying
ref_id: US2013313493
ref_type: patent
severity: novelty_destroying
ref_id: WO2015065611
ref_type: patent
severity: novelty_destroying
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ref_type: patent
severity: novelty_destroying
Final disposition: pending (2020-12-30)