TIN-BASED STABILIZERS FOR POST-HALOGENATED POLYMERS
The invention relates to stabilized chlorinated polyvinyl chloride (CPVC) polymer formulations, and the stabilizers used therein. The stabilization is achieved through the use of a sulfide containing organotin species in conjunction with co-stabilizers and organic extenders which provide increased thermal stability relative to traditional organotin stabilizers.
1 . A stabilizer for post-halogenated halogen-containing polymers, the stabilizer comprising
a. dialkyltin bis(ethylhexylmercaptoacetate) (dialkyltin bis(EHMA)), the dialkyltin bis(EHMA) having ligands,
b. wherein some quantity of the ligands in the dialkyltin bis(EHMA) are synthetically replaced with a sulfide, and
c. an organic stabilizer extender.
2 . The stabilizer for post-halogenated halogen-containing polymers of claim 1 , wherein the dialkyltin is dibutyltin.
3 . The stabilizer for post-halogenated halogen-containing polymers of claim 1 , wherein the dialkyltin is dimethyltin.
4 . The stabilizer of claim 1 wherein the extender is chosen from the group consisting of epoxidized soybean oil (ESBO) or dodecylmercaptan (DDM).
5 . A method of using the stabilizer of claim 1 in production of post-halogenated halogen-containing polymers, the method comprising steps of: (a) blending post-halogenated polymer resin with one or more process aids, one or more impact modifiers, one or more ax lubricants, and TiO 2 ; and, (b) following standard additive addition order and temperature.
6 . The method of claim 5 wherein the post-halogenated halogen-containing polymer is chlorinated poly vinyl chloride (CPVC).
7 . An article comprised of a post-halogenated halogen-containing polymer that has been preparing using the stabilizer of claim 1 .
8 . The article of claim 7 wherein the post-halogenated halogen-containing polymer is CPVC.
9 . A sulfided stabilizer composition for the stabilization of post halogenated polymers of the formula R 4-2x-y Sn(S) x L y , where x is from 0.05 to 0.75 and y is from 1.5 to 2.8.
10 . The sulfided stabilizer composition of claim 9 , wherein R is linear or branched alkyls from C1 to C10.
11 . The sulfided stabilizer composition of claim 9 , wherein L is drawn from traditional ligands used in tin-based thermal stabilizers for post-halogenated polymers and include, but not limited to, mercapto esters, mercaptides, thio alcohols, and carboxylates.
12 . The stabilizer compositions described in claim 9 used as a stabilizer system to provide thermal protection for post halogenated polymers used alone or in combination with other traditional thermal stabilizers.
13 . The stabilizing systems described in claim 12 used in combination with traditional organic or inorganic co-stabilizers including, but not limited to, mercaptans, fatty acid esters, epoxidized fatty acids and hydrocarbon oils and waxes.
14 . The stabilizing systems described in claim 13 in which the ratio of sulfided tin-based component to organic extender(s) is from 1:1 to 5:1.
15 . (canceled)
16 . The stabilizer of claim 2 wherein the extender is chosen from the group consisting of epoxidized soybean oil (ESBO) or dodecylmercaptan (DDM).
17 . The stabilizer of claim 3 wherein the extender is chosen from the group consisting of epoxidized soybean oil (ESBO) or dodecylmercaptan (DDM).
18 . A method of using the stabilizer of claim 2 in production of post-halogenated halogen-containing polymers, the method comprising steps of:
(a) blending post-halogenated polymer resin with one or more process aids, one or more impact modifiers, one or more ax lubricants, and TiO 2 ; and, (b) following standard additive addition order and temperature.
19 . A method of using the stabilizer of claim 3 in production of post-halogenated halogen-containing polymers, the method comprising steps of:
(a) blending post-halogenated polymer resin with one or more process aids, one or more impact modifiers, one or more ax lubricants, and TiO 2 ; and, (b) following standard additive addition order and temperature.
20 . The stabilizer for post-halogenated halogen-containing polymers of claim 1 , wherein the dialkyltin is dioctyltin.