Polymer Technology Corporation

Polaroid Corporation

Richard C Baron

Scott D Rothenberger

Neil C Mattucci

Leon D Cerankowski

A rotary engine comprised of a pair of counterrotating rotors within a non-rotating outer housing. Each of the rotors is coupled to a common power shaft, one directly and the other through a reversing gear arrangement. Both are driven by the hyper-expansion of combustion gases in a repeating combustion cycle. Each has a generally circular, nearly frictionless working surface perpendicular to the power shaft axis. Each rotor surface defines chambers which rotate past each other. Within such chambers, compressed air and fuel are introduced, mixed, ignited, allowed to hyper-expand (and thus cause the rotation) and exhausted. The power shaft may be connected to a conventional clutch, torque converter, gearbox, differential, alternator or a similar system.

Rotary engine

Carboxylic acid esters devoid of beta hydrogens are homopolymerized or copolymerized with contact lens organic materials to form desirable contact lens materials and contact lenses. These materials have good contact lens properties, including desirable DK values, hardness, machineability and a desirable refractive index of at least 1.

Polymeric compositions useful in oxygen permeable contact lenses

Synthetic polymers and a process for their preparation by a polyisocyanate polyaddition reaction are described. Synthetic polymers are provided by the reaction of a polyisocyanate with substantially an equivalent amount of an oligomeric para-, meta- or di-meta-aminobenzoic acid ester or amide having the formula ##STR1## wherein n is an integer of from 2 to 4; each x is one or two; each benzoyl nucleus is para-, meta- or di-meta- amino-substituted; each Z is ##STR2## and G is an n-valent radical which may be obtained by the removal of hydroxyl or amino groups from an n-valent oligomeric polyol or polyamine having a molecular weight of from about 400 to about 6,000. Useful synthetic polymeric products can be simply and effectively provided by reaction of the polyisocyanate and the oligomeric aminobenzoic acid ester or amide reactants without the requirement of additional curative or chain-extending agents.

Synthetic polymers by polyisocyanate polyaddition process

Diamine cured polyurethane products are prepared by combining an isocyanate terminated urethane prepolymer with a compound of the formula: ##SPC1## Wherein X is a 2-12 carbon alkylene or cycloalkylene group.

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Tewksbury, MA, United States of America

Richard C Baron