# US 2025/0154352 A1 · Polybutylene terephthalate composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0154352 A1 - Document ID: US20250154352A1 - Status: Published application - Kind: A1 - Application number: 18/838,642 - Filed: 2023-02-06 - Published: 2025-05-15 - Earliest claimed: 2022-02-16 - Assignees: BASF SE - Applicants: BASF SE - Inventors: Zhen Ke Wei; Qiong Jie Han; Li Xia Wang; Xi Lin - Web page: https://patentgrep.com/patent/US20250154352A1 ## CPC - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08L 67/06: Unsaturated polyesters - C08K 3/26: Carbonates; Bicarbonates - C08K 3/40: Glass - C08K 7/14: Glass - C08G 63/183: Terephthalic acids - C08G 63/199: Acids or hydroxy compounds containing cycloaliphatic rings - C08K 2003/262: {Alkali metal carbonates} - C08L 2201/10: Transparent films; Clear coatings; Transparent materials - C08L 2205/02: containing two or more polymers of the same C08L -group - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract Disclosed is a polybutylene terephthalate composition, comprising polybutylene terephthalate (PBT); amorphous polymer, in which the amorphous polymer has a refractive index of at least 1.55, and does not comprise carbonate group; alkali metal carbonate and/or bicarbonate; optionally glass fiber; and optionally additives. This polybutylene terephthalate composition exhibits greatly enhanced LT, in the meantime, balanced other properties are retained comparing with polybutylene terephthalate composition without such carbonate and/or bicarbon. ## Claims ### Claim 1 A polybutylene terephthalate composition, comprising: (A) a polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and having no carbonate group in the repeating units of the amorphous polymer, the refractive index is measured at 25° C. and wavelength of 589 nm according to ASTM D542, (C) an alkali metal carbonate and/or bicarbonate, (D) an optional glass fiber, and (E) an optional additive. ### Claim 2 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the amorphous polymer (B) has a refractive index of from 1.55 to 1.60. ### Claim 3 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the amorphous polymer is selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyesters, and mixtures thereof. ### Claim 4 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the polystyrene comprises units derived from 50 mol % to 100 mol % of at least one monomer having the Formula I, based on total units of polystyrene: wherein R1 is same or different and is selected from the group consisting of hydrogen, C1-C10 alkyl group, C1-C6 alkenyl group, C4-C10 cycloaliphatic group, C6-C12 aromatic hydrocarbon group, C1-C4 alkoxy group, and halogen atoms; R2 is hydrogen and/or C1-C4 alkyl group; styrene-acrylonitrile copolymer comprising: (B.1) 50 to 99 parts by mass of vinyl aromatic monomer and/or ring-substituted vinyl aromatic monomer, (B.2) 1 to 50 parts by mass of vinyl cyanide monomer; and optionally (B.3) C1-C8 alkyl methacrylate, based on the total parts by mass of monomers of styrene-acrylonitrile copolymer; or amorphous copolyester having at least two different repeating units RP1 and RP2 in a combined amount of at least 55 mol %, based on the total repeating units of the copolyester; wherein the repeating unit RP1 is derived from glycol and dicarboxylic acid, the dicarboxylic acid includes terephthalic acid and optionally other dicarboxylic acid, the repeating unit RP2 is derived from glycol and dicarboxylic acid; a mole ratio of the glycol in the RP1 to the glycol in the RP2 is from 2:8 to 8:2. ### Claim 5 (depends on 4) The polybutylene terephthalate composition according to claim 4, wherein Formula I is selected from the group consisting of styrene, alpha-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-alpha-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethyl styrene, 2-isopropyl styrene, 3-isopropyl styrene, 4-isopropyl styrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxy styrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenylnaphthalene, styrene-acrylonitrile copolymer is selected from the group consisting of styrene/acrylonitrile copolymers, α-methylstyrene/acrylonitrile copolymers, styrene acrylonitrile-maleic anhydride copolymers, styrene-acrylonitrile-phenylmaleimide copolymers, α-methylstyrene-acrylonitrile-methyl methacrylate copolymers, α-methyl-styrene-acrylonitrile-t-butylmethacrylate copolymers, and styrene-acrylonitrile-t-butylmethacrylate copolymers. the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or the mixture thereof. ### Claim 6 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein alkali metal carbonate and/or bicarbonate (C) is selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate. ### Claim 7 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the polybutylene terephthalate resin (A) is in an amount of from 10 wt. % to 90 wt. %, based on the total weight of the polybutylene terephthalate composition. ### Claim 8 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the amorphous polymer (B) is in an amount of from 1 wt. % to 50 wt. %, based on the total weight of the polybutylene terephthalate composition. ### Claim 9 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the alkali metal carbonate and/or bicarbonate (C) is in an amount of from 0.01 wt. % to 10 wt. %, based on the total weight of the polybutylene terephthalate composition. ### Claim 10 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the glass fiber (D) is in an amount of from 0 wt. % to 50 wt. %, based on the total weight of the polybutylene terephthalate composition. ### Claim 11 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the glass fiber (D) is E-glass fiber and/or D-glass fiber. ### Claim 12 (depends on 1) The polybutylene terephthalate composition according to claim 1, wherein the additives (E) are in an amount of 0.01-15 wt. %, based on the total weight of the polybutylene terephthalate composition. ### Claim 13 (depends on 1) An article produced from the polybutylene terephthalate composition according to claim 1. ### Claim 14 (depends on 13) The article according to claim 13, wherein the article is a sensor, electric control unit, or advanced driver assistance system device for automobile. ### Claim 15 A method for improving laser transmittance of a polybutylene terephthalate composition comprising application of an alkali metal carbonate and/or bicarbonate. ### Claim 16 (depends on 15) The method according to claim 15, wherein the polybutylene terephthalate composition comprises (A) a polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and having no carbonate group in the repeating units of the amorphous polymer, the refractive index is measured at 25° C. and wavelength of 589 nm according to ASTM D542, (C) an alkali metal carbonate and/or bicarbonate, (D) an optional glass fiber, and (E) an optional additive.