Hydrophilic nitrile rubber

Details Hydrophilic nitrile rubber Hydrophilic nitrile rubber

1998-08-03

1999-10-19

Cain, Edward J.

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

Synthetic resins

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

5253292, 5253293, C08F 2044

Patent

active

059690518

ABSTRACT:
The present invention relates to a hydrophilic nitrile rubber which is particularly useful in making photopolymer formulations for printing plates utilized in flexographic printing applications. The hydrophilic nitrile rubber of this invention is made by treating a standard carboxylated nitrile rubber with a sulfur trioxide/dimethylformamide complex. This invention more specifically discloses a process for preparing a hydrophilic nitrile rubber composition which is particularly useful in making photopolymer formulations for printing plates, said process comprising the steps of (1) reacting a carboxylated nitrile rubber with a complex of sulfur trioxide and dimethylformamide to produce a nitrile rubber containing sulfonated carboxyl groups and (2) reacting the nitrile rubber containing sulfonated carboxyl groups with a salt selected from the group consisting of sodium hydroxide and potassium hydroxide to produce the hydrophilic nitrile rubber.

REFERENCES:
patent: 4446282 (1984-05-01), Jalics
patent: 5310815 (1994-05-01), Senyek et al.
patent: 5753772 (1998-05-01), Laurich et al.
patent: 5859132 (1999-01-01), Ngoc

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