US 11,859,038 B2
Method for manufacturing a block copolymer of polyamide acid
Kuan-Wei Lee, Taoyuan (TW); Szu-Hsiang Su, Taoyuan (TW); Shou-Jui Hsiang, Tayuan (TW); Pei-Jung Wu, Taoyuan (TW); and Wei-Hsin Huang, Taoyuan (TW)
Assigned to Zhen Ding Technology Co., Ltd., Taoyuan (TW)
Filed by Zhen Ding Technology Co., Ltd., Taoyuan (TW)
Filed on Jul. 22, 2020, as Appl. No. 16/936,204.
Claims priority of application No. 201910886468.8 (CN), filed on Sep. 19, 2019.
Prior Publication US 2021/0087319 A1, Mar. 25, 2021
Int. Cl. C08J 5/18 (2006.01); C08F 293/00 (2006.01)
CPC C08F 293/00 (2013.01) [C08J 5/18 (2013.01); C08J 2377/06 (2013.01)] 2 Claims
 
1. A method for manufacturing a block copolymer of polyamide acid comprising:
providing first dianhydride monomers and second dianhydride monomers, wherein each first dianhydride monomer is p-phenylene bis(trimellitate) dianhydride; each second dianhydride monomer is 4,4′-(4,4′-isopropylidenediphenoxybis(phthalic anhydride);
providing first diamine monomers and second diamine monomer, wherein each first diamine monomer is 4-aminophenyl-4-aminobenzoate; each second diamine monomer is 4,4′-(4,4′-isopropylidenediphenyl-1,1′-diyldioxy)dianiline;
mixing and polymerizing the first dianhydride monomers and the second diamine monomers to form a first polyamide acid, and mixing and polymerizing the second dianhydride monomers and the first diamine monomers to form a second polyamide acid;
undergoing a polymerization reaction between the first polyamide acid and the second polyamide acid to obtain the block copolymer of polyamide acid;
wherein the first dianhydride monomers and the second diamine monomers are mixed in a molar ratio of 9:10 to 11:10.