Patent ID: 11964032
Assignee: WANHUA CHEMICAL GROUP CO., LTD.
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  C | IPC A  C

Claim 0:
1. A mask substrate composition, comprising, by total mass of the mask substrate composition, the following components: (a) 5-90 wt % of an aqueous polyurethane dispersion; and (b) 10-95 wt % of an aqueous polyurethane dispersion; wherein the aqueous polyurethane dispersion (a) is prepared by reaction of reaction raw materials comprising
a1) polyisocyanate, (a2) polyester polyol, (a3) a low-molecular weight diol chain extender, (a4) a polyamine chain extender, (a5) a polyamine chain extender and (a6) a small-molecule monoamino end-capping agent; wherein the aqueous polyurethane dispersion (a) is prepared by reaction of the raw materials of the following mass percentages based on the mass of polyurethane:
(a1) polyisocyanate 15-25 wt %;
(a2) polyester polyol 65-80 wt %;
(a3) a low-molecular weight diol chain extender 0.1-3 wt %;
(a4) a polyamine chain extender (a) 0.01-3 wt %;
(a5) a polyamine chain extender (b) 1-8 wt %; and
(a6) a small-molecule monoamino end-capping agent 0.1-2 wt %;
(b) the aqueous polyurethane dispersion (b) is prepared by reaction of reaction raw materials comprising (b1) polyisocyanate, (b2) polyester polyol, (b3) polyethylene glycol monomethyl ether, (b6) a polyhydroxyl chain extender, (b4) a polyamine chain extender and (b5) a polyamine chain extender; wherein the (b) aqueous polyurethane dispersion (b) is prepared by reaction of the raw materials of the following mass percentages based on the mass of polyurethane:
(b1) polyisocyanate 14-35 wt %;
(b2) polyester polyol 60-83.8 wt %;
(b3) polyethylene glycol monomethyl ether 1-3 wt %;
(b6) a polyhydroxyl chain extender 0.1-1 wt %;
(b4) a polyamine chain extender 0.1-5 wt %; and
(b5) a polyamine chain extender(b′) 1-2 wt %; and wherein
(a4) the polyamine chain extender and (b4) the polyamine chain extender are polyamine chain extenders which are not substituted by ionic or potentially ionic groups;
(a5) the polyamine chain extender and (b5) the polyamine chain extender are polyamine chain extenders which are substituted by ionic or potentially ionic groups; and
(b6) the polyhydroxy] chain extender is a low-molecular weight polyhydroxyl chain extender.