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Novel urethane polythiols
| Details |
Inventors: Guthrie, James Leverette; Kehr, Clifton Leroy;
Assignee: W. R. Grace & Co. (New York, NY)
Primary Examiner: Killos; Paul J.
Assistant Examiner:
Attorney, Agent or Firm: Fisher; Elton
A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be dithiol, with an isocyanate such as a phenyl isocyanate, toluene diisocyanate, and the like. |
|
DETAILED DESCRIPTION OF THE INVENTION It is an object of this invention to provide urethane polythiols which can be reacted with polyenes to form polymers.
An admixture of such polythiol and such polyene can be polymerized by irradiation with actinic light preferably in the presence of a photocuring rate accelerator such as benzophenone, acetophenone, or the like.
An admixture of such polythiol and such polyene can also be cured with a peroxide-free radical initiator such as methyl ethyl ketone hydroperoxide or the like.
Such polymers are useful: 1.
For preparing printing plates.
2.
For preparing protective coatings on surfaces including wooden and metallic surfaces.
3.
As photoresists where etching designs on metallic surfaces.
4.
As bonding agents for laminating (bonding) two or more substrates together.
The following are among the many U.
S.
Pats.
which teach the reaction of polythiols with polyenes to form polymers:
______________________________________
3,535,193 (Prince, 161/88)
3,578,614 (Wszolek, 260/13)
3,615,450 (Werber et al, 95/35.
1)
3,660,088 (Lundsager, 96/36)
3,660,217 (Kehr et al, 161/68)
3,661,744 (Kehr et al, 204/159.
14)
3,662,022 (Lard, 260/837R)
3,662,023 (Kehr et al, 260/858)
3,676,283 (Kehr et al, 161/88)
3,725,228 (Kehr et al, 204/159.
14)
3,725,229 (Kehr et al, 204/159.
14)
3,728,240 (Lard, 204/159.
16)
3,835,085 (Wrzesinski, 204/159.
23)
______________________________________
As used herein, the term "polythiol" means a thiol which contains at least 2 SH groups per molecule (i.
e.
, it has a functionality of at least 2).
As used herein, the term "polyene" means a polyfunctional compound having at least 2 terminal reactive ethylenically unsaturated carbon-to-carbon bonds per molecule (i.
e.
, it has a functionality of at least 2).
As is well known to those skilled in the art, the total functionality of the polythiol plus the polyene with which it reacts to form a polymer must be greater than 4 and neither the polythiol nor the polyene (polyfunctional compound) can have a functionality less than 2
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