Lankford and Nimitz said that a refrigerant they designated R-12A (a near azeotropic blend of 13 mole percent
CF3I and 87 mole percent
HFC-152a) was put in service in a small R-12 instrumental refrigerator, without an oil change, and run for more than 1,500 hours without any apparent problems.
These tests have detection limits of about 001 mole percent
The numeral following PVPDMS indicates the mole percent
of VPDMS monomer units in the copolymer.
diacid residues, comprising about 30 to about 70 mole percent
of the residues of isoph-thalic acid and about 70 to about 30 mole percent
of the residues of adipic acid, based on the total moles of diacid residues; ii.
C, MW 24) in an amount of 2% to 40% by weight, wherein at least a portion of the ethylenically unsaturated groups are incorporated by reacting an isocyanate group with the reaction product of (meth)acrylic acid with B-caprolactone and wherein the preceding percentages are based on the solids content of the polyisocyanate addition compounds and wherein fluorine is incorporated by reacting an isocyanate group with a compound containing two or more carbon atoms, one or more hydroxyl groups and one or more fluorine atoms to form urethane groups and optionally allophanate groups, provided that more than 50 mole percent
of the groups that chemically incorporate fluorine into the polyisocyanate addition compounds are urethane groups.