摘要:
A light-diffusing film comprises about 90 wt. % to about 99.999 wt. % polycarbonate, wherein the polycarbonate comprises a yellowness index of about 0.8 to about 1.5 as measured in accordance with ASTM E313-73 (D1925); about 0.001 wt. % to about 3 wt. % light-diffusing particles; wherein weight percents are based on a total weight of the light-diffusing film; and wherein the light-diffusing film comprises a light transmission of about 45% to about 65% as measured in accordance with ASTM D1003-00, and a hiding power of 0 to about 0.5.
摘要:
A light-diffusing film comprises about 90 wt. % to about 99.999 wt. % polycarbonate, wherein the polycarbonate comprises a yellowness index of about 0.8 to about 1.5 as measured in accordance with ASTM E313-73 (D1925); about 0.001 wt. % to about 3 wt. % light-diffusing particles; wherein weight percents are based on a total weight of the light-diffusing film; and wherein the light-diffusing film comprises a light transmission of about 45% to about 65% as measured in accordance with ASTM D1003-00, and a hiding power of 0 to about 0.5.
摘要:
Disclosed herein are light diffusing films, methods of making the same and articles using the same. In one embodiment, a method of making a light-diffusing film comprises: mixing about 90 wt. % to about 99.999 wt. % of a powdered polycarbonate and about 0.001 wt. % to about 3 wt. % light-diffusing particles to form a mixture, wherein weight percents are based on a total weight of the light-diffusing film; melting the mixture to form a melt; and extruding the melt in the form of a sheet to form the light-diffusing film. The light-diffusing film comprises a hiding power of about 0 to 0.5 that is mathematically described by the following equation: Hiding power ( % ) = 1 - ∑ i = 1 n - 1 L i ( on ) ∑ j = 1 n - 1 L j ( off ) × 100 wherein: Li(on) is luminance above ith cold cathode fluorescent lamp, Lj(off) is luminance at a midpoint between cold cathode fluorescent lamp j and cold cathode fluorescent lamp j+1, and n equals number of CCFL lamps.
摘要:
Described herein, in the preferred embodiment, is a leonardite-based polyurethane resin binder that may be used, among other applications, as a binder in combination with foundry aggregate, e.g., sand, for molding or casting metal parts. The binders described herein comprise a humic substance, preferably leonardite, combined with a polymerizable polyol, an isocyanate, and a polymerization catalyst to make a polyurethane resin binder in situ in a foundry aggregate, such as sand. The lignite is mixed with the polymerizable polyol and dispersing agents as additives to improve the suspension quality and binder performance of the lignite-containing part of the binder components.
摘要:
Described herein, in the preferred embodiment, is a leonardite-based polyurethane resin binder that may be used, among other applications, as a binder in combination with foundry aggregate, e.g., sand, for molding or casting metal parts. The binders described herein comprise a humic substance, preferably leonardite, combined with a polymerizable polyol, an isocyanate, and a polymerization catalyst to make a polyurethane resin binder in situ in a foundry aggregate, such as sand. The lignite is mixed with the polymerizable polyol and dispersing agents as additives to improve the suspension quality and binder performance of the lignite-containing part of the binder components.
摘要:
A polysiloxane copolymer composition comprises: a polysiloxane unit comprising 4 to 50 siloxane units, and a polyester-polycarbonate unit consisting of 50 to 100 mole percent of arylate ester units, less than 50 mole percent aromatic carbonate units, less than 30 mole percent resorcinol carbonate units, and less than 35 mole percent bisphenol carbonate units, wherein the siloxane units are present in the polysiloxane unit in an amount of 0.2 to 10 wt % of the total weight of the polysiloxane copolymer composition, and wherein the polysiloxane copolymer composition has a 2 minute integrated heat release rate of less than or equal to 65 kilowatt-minutes per square meter (kW-min/m2) and a peak heat release rate of less than 65 kilowatts per square meter (kW/m2) as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d). A window article for an aircraft, comprising the polysiloxane copolymer composition, is also disclosed.
摘要翻译:聚硅氧烷共聚物组合物包括:包含4至50个硅氧烷单元的聚硅氧烷单元和由50至100摩尔%的芳基酯单元,小于50摩尔%的芳族碳酸酯单元,小于30摩尔%的间苯二酚碳酸酯组成的聚酯 - 聚碳酸酯单元 单体和小于35摩尔%的双酚碳酸酯单元,其中硅氧烷单元以聚硅氧烷共聚物组合物总重量的0.2-10重量%的量存在于聚硅氧烷单元中,并且其中聚硅氧烷共聚物组合物具有2 小于或等于65千瓦分/平方米(kW-min / m2)的小时集成放热速率和小于65千瓦/平方米(kW / m 2)的峰值放热率,使用 FAR F25.4,根据联邦航空条例FAR 25.853(d)。 还公开了一种包含聚硅氧烷共聚物组合物的飞机用窗构件。
摘要:
A polysiloxane copolymer composition comprises: a polysiloxane unit comprising 4 to 50 siloxane units, and a polyester-polycarbonate unit consisting of 50 to 100 mole percent of arylate ester units, less than 50 mole percent aromatic carbonate units, less than 30 mole percent resorcinol carbonate units, and less than 35 mole percent bisphenol carbonate units, wherein the siloxane units are present in the polysiloxane unit in an amount of 0.2 to 10 wt % of the total weight of the polysiloxane copolymer composition, and wherein the polysiloxane copolymer composition has a 2 minute integrated heat release rate of less than or equal to 65 kilowatt-minutes per square meter (kW-min/m2) and a peak heat release rate of less than 65 kilowatts per square meter (kW/m2) as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d). A window article for an aircraft, comprising the polysiloxane copolymer composition, is also disclosed.
摘要:
Photoinitiator modified silicate and ethylenically unsaturated monomer are reacted in solvent to cause living polymerization of monomer and exfoliation of silicate layers and cause attachment of silicate layers to polymer chains, thereby providing dispersed homopolymer or block copolymer silicate nanocomposites.
摘要:
A thermoplastic composition comprises a polycarbonate having repeating structural carbonate units of the formula (1): wherein at least 60 percent of the total number of R1 groups contain aromatic organic groups and the balance thereof are aliphatic, alicyclic, or aromatic groups; and wherein the polycarbonate comprises terminal groups derived from reaction with a cyanophenol of the formula wherein Y is a halogen, C1-3 alkyl group, C1-3 alkoxy group, C7-12 arylalkyl, C7-12 alkylaryl, or nitro group, y is 0 to 4, and c is 1 to 5, provided that y+c is 1 to 5; and a flame retardant. The compositions are useful in the manufacture of a wide variety of parts, particularly those having a thin wall.
摘要:
A reaction product comprises a first polyester-polycarbonate comprising a polyester unit and a polycarbonate unit, a second polyester-polycarbonate comprising a polyester unit and a polycarbonate unit, and a transesterification catalyst. The reaction product has a haze of less than 1.7%, specifically less than 1.0% as measured at a thickness of 3.2 mm according to ASTM D1003-00. A thermoplastic composition comprising the reaction product and articles formed from therefrom are disclosed. A method of forming the reaction product is also disclosed.