Patent ID: 6846789

Claim:
A composition for removing photoresist materials and other plastics from substrates, said composition comprising a mixture of at least one dense phase fluid and at least one dense phase fluid modifier, wherein said dense fluid modifier has the formula wherein R 1 , R 2 , R 3 , and R 4 are independently selected from hydrogen, fluorine, CH (3-x) F x wherein x is 0, 1, 2, or 3; C 2 H (5-x) F x wherein x is 0, 1, 2, 3, 4, or 5; C 3 H (7-x) F x wherein x is 0, 1, 2, 3, 4, 5, 6, or 7; and C 4 H (9-x) F x wherein x is 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9; or wherein said dense phase fluid modifier has the formula wherein R 5 and R 6 are independently selected from hydrogen, CH (3-x) F x wherein x is 0, 1, 2, or 3; C 2 H (5-x) F x wherein x is 0, 1, 2, 3, 4 or 5; C 3 H (7-x) F x wherein x is 0,1, 2, 3, 4, 5, 6, or 7; and C 4 H (9-x) F x wherein x is 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9; or wherein said dense phase fluid modifier has the formula wherein R 7 is selected from methyl, ethyl, propyl, butyl, trifluoromethyl, and heptafluoropropyl; and wherein R 8 is selected from methyl, ethyl, propyl, butyl, trifluoromethyl, and pentafluoroethyl, with the proviso that x must be greater than zero when the at least one dense phase fluid is carbon dioxide.