ether phthalate and di tripropylene glycol monoethyl ether phthalate examples of trimellitates include tri diethylene glycol monomethyl ether trimellitate di triethylene glycol monomethyl ether trimellitate di diethylene glycol monoethyl ether trimellitate di triethylene glycol monoethyl ether trimellitate di dipropylene glycol monoethyl ether trimellitate and di tripropylene glycol monoethyl ether trimellitate the preferred stabilizers are ethers and esters of peg and ppg because many are commercially available polyethylene glycol and polypropylene glycol ethers and esters that are not commercially available are easily made by for example condensing polyethylene glycol or polypropylene glycol with an alcohol to make an ether or with an acid chloride to make an ester as is well known in the art of the above compounds the peg and ppg ethers silyl ethers and esters are well known phthalates such as dimethyl glycol phthalate diethyl glycol phthalate dibutyl glycol phthalate di 2 2 methoxyethoxy ethyl phthalate di 2 2 ethoxyethoxy ethyl phthalate di 2 2 butoxyethoxy ethyl phthalate di 2 2 hexyloxyethoxy ethyl phthalate bis 2 2 2 ethoxyethoxy ethoxy ethyl phthalate are also known the known trimellitates include tris 2 methoxyethyl trimellitates and tris 2 2 methoxyethoxy ethyl trimellitates the known phosphorous compounds include tris 2 methoxyethyl phosphite tris2 2 methoxyethoxy ethyl phosphite tris 2 methoxyethyl phosphate tris 2 2 methoxyethoxy ethyl phosphate tris 2 2 2 methoxyethoxy ethoxy ethyl phosphate the tin compounds some of the phosphites phosphates phthalates and trimellitates are believed to be novel compounds in particular compounds having the general formula r q sn u2014 mr u2033 u2014 och 2 u2014 r u2032 ch m u2014 ot 4 q p u2014 och 2 u2014 r u2032 ch m u2014 ot 3 where each.