US 12,221,501 B2
Solvent-free adhesion-promoting chain extender, preparation method therefor, and application thereof
Hao Duan, Shanghai (CN); Congshan Zhu, Shanghai (CN); and Shengren Si, Shanghai (CN)
Assigned to FINE-BLEND POLYMER (SHANGHAI) CO., LTD., Shanghai (CN)
Filed by FINE-BLEND POLYMER (SHANGHAI) CO., LTD., Shanghai (CN)
Filed on Feb. 23, 2022, as Appl. No. 17/678,432.
Application 17/678,432 is a continuation of application No. PCT/CN2020/097303, filed on Jun. 20, 2020.
Claims priority of application No. 202010307332.X (CN), filed on Apr. 17, 2020.
Prior Publication US 2022/0177620 A1, Jun. 9, 2022
Int. Cl. C08F 212/08 (2006.01); C08G 63/91 (2006.01)
CPC C08F 212/08 (2013.01) [C08G 63/916 (2013.01)] 5 Claims
 
1. A solvent-free adhesion-promoting chain extender, wherein the solvent-free adhesion-promoting chain extender is prepared by a method consisting of the following steps:
mixing a mixture consisting of an aromatic vinyl monomer, an acrylate monomer, an initiator, a molecular weight regulator and water,
heating and polymerizing to prepare the solvent-free adhesion-promoting chain extender;
when a mass percentage of the aromatic vinyl monomer and the acrylate monomer is 100%, a mass percentage of the aromatic vinyl monomer is 76-99%,
wherein a temperature of the heating and polymerizing is 65-110° C., and a reaction time is 2-10 hours,
wherein the heating and polymerizing is performed at 65-80° C. for 2-6 hours, and then at 90-110° C. for 0.5-2 hours, and
wherein after the heating and polymerizing is completed, the solvent-free adhesion-promoting chain extender is subjected to a double-screw secondary reaction granulation.