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

Claim 15:
16. A method for preparing the mask substrate of claim 8, comprising the following steps:
the aqueous polyurethane dispersion (a) and the aqueous polyurethane dispersion (b) are mixed to obtain a phase A; (h) the deionized water and (c) the thickener are mixed to obtain a phase B; and (d) the emulsifier and (e) the grease are mixed to obtain a phase C;
in the presence of the phase C, the phase B and the phase C are respectively heated to 70-85° C. and mixed well to obtain a phase B+C, and after the temperature drops to the range of 50° C. to room temperature, the phase A and other components and are added and mixed well; and
in the absence of the phase C, the phase A and the phase B are mixed at the room temperature to obtain a phase A+B, and other components are added and mixed well.