Polyurethane/thiourethane-based optical resin and process...

Details Polyurethane/thiourethane-based optical resin and process... Polyurethane/thiourethane-based optical resin and process...

2011-04-26

2011-04-26

Gulakowski, Randy (Department: 1766)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C528S085000, C528S074000, C528S077000, C528S075000, C528S373000

Reexamination Certificate

active

07932327

ABSTRACT:
Provided is a process which can be carried out upon the production of a polyurethane/thiourethane-based resin with the use of a polyisocyanate compound, a polyol compound, and a polythiol compound, without causing abrupt heat generation or viscosity increase. At least one polyol compound having at least one ether bond and two or more hydroxy groups in a molecule is used as the polyol compound, whereby a large heat generation or an abrupt viscosity increase are prevented from occurring upon blending monomer.

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