US 11,674,015 B2
Polyamides with improved optical properties
Florian Richter, Mannheim (DE); Rainer Xalter, Heidelberg (DE); Hye Jin Park, Osnabrueck (DE); and Raphaël Dabbous, Riehen (CH)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 15/565,273
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Apr. 13, 2016, PCT No. PCT/EP2016/058086
§ 371(c)(1), (2) Date Oct. 9, 2017,
PCT Pub. No. WO2016/166140, PCT Pub. Date Oct. 20, 2016.
Claims priority of application No. 15163880 (EP), filed on Apr. 16, 2015.
Prior Publication US 2018/0072868 A1, Mar. 15, 2018
Int. Cl. C08K 5/29 (2006.01); C07C 265/02 (2006.01); C07C 265/14 (2006.01); C08L 77/00 (2006.01)
CPC C08K 5/29 (2013.01) [C07C 265/02 (2013.01); C07C 265/14 (2013.01); C08L 77/00 (2013.01); C08J 2300/22 (2013.01)] 7 Claims
 
1. A method of producing a molding comprising a thermoplastic molding composition comprising admixing
A) from 30 to 99% by weight of a thermoplastic polyamide selected from the group consisting of PA 6 and PA 66,
B) from 0.01 to 10% by weight of cyclohexyl trans-1,4-diisocyanate and phenylene 1,4-diisocyanate, and
C) from 0 to 60% by weight of other additional substances,
where the sum of the percentages by weight of A) to C) is 100% and the thermoplastic molding composition is free of polyoxymethylene,
wherein the molding has improved haze, measured in accordance with ASTM D1003, and/or improved clarity, measured in accordance with ASTM D1003, and/or increased laser transparency, measured at a wavelength of 1064 nm by means of a thermoelectric power measurement,
wherein the haze value of the molding, measured in accordance with ASTM D1003, is at least 5% lower than that of a reference polymer composition without component B), measured from a test sample of thickness 1.3 mm,
wherein the clarity value of the molding, measured in accordance with ASTM D1003, is at least 5% higher than that of a reference polymer composition without component B), measured from a test sample of thickness 1.3 mm, and
wherein the laser transparency of the molding, measured at a wavelength of 1064 nm by means of a thermoelectric power measurement, is at least 1% higher than that of a reference polymer composition without component B), measured from a test sample of thickness 1.3 mm.