Sheet handling scuffer paddle wheel made of polyether urethane

Details Sheet handling scuffer paddle wheel made of polyether urethane Sheet handling scuffer paddle wheel made of polyether urethane

1991-09-30

1992-08-25

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 76, 271178, C08G 1810

Patent

active

051420163

ABSTRACT:
A sheet handling apparatus for stacking successive sheets has a stacking tray, registration gate and a scuffer paddle wheel made of a polyurethane elastomer obtained by the reaction of a polytetramethylene ether glycol having the formula HO[(CH.sub.2).sub.4 O].sub.n H where n is from 10 to 60, preferably 55 to 60, and from about 20 to about 95 parts preferably 22 to 26 parts, by weight per 100 parts by weight of said glycol of a diisocyanate selected from the group consisting of diphenylmethane diisocyanates, toluene diisocyanates, naphthalene diisocyanates and blends thereof and a sufficient amount of cross linking agents to provide a crosslinked elastomer, said crosslinking agents comprising a mixture of from about 75% to 60% by weight of diol having the formula HO(R.sub.1)OH where R.sub.1 is a straight or branched chain alkyl group having from 2 to 12 carbon atoms and from about 25% to 40% by weight of a triol having the formula:

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patent: 4958197 (1990-09-01), Kinashi et al.
patent: 5014977 (1991-07-01), Moore et al.

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