Prestabilization of halogen-containing polymers

Abstract

The invention relates to a process for preparing a stabilized suspen-sion/emulsion polymer of halogen-containing monomers with addition of a polymer stabilizer mixture compatible with the polymerization medium prior to, during or directly after the polymerization process, and to the polymers pre-pared by this process.

1 . A process for preparing a stabilized suspension/emulsion polymer of halogen-containing monomers comprising adding a polymer thermal stabilizer mixture compatible with the polymerization medium prior to, during or directly after the polymerization process prior to isolation of the polymer.  
     
     
         2 . The process of  claim 1 ,—wherein the polymer thermal stabilizer mixture comprises perchlorate compounds and/or alkanolamines and/or salts of these.  
     
     
         3 . The process of  claim 1  wherein the polymer thermal stabilizer mixture comprises at least 
 a) a perchlorate and/or  
 b) an alkanolamine of the formula (I)  
                     
 where  
 x=1, 2 or 3;  
 y=1, 2, 3, 4, 5 or 6;  
 n=from 1 to 10;  
 R 1  and R 2 =independently of one another H, C 1 -C 22 -alkyl, -[—(CHR 3   a ) y -CHR 3   b -O—] n -H, -[—(CHR 3   a ) y -CHR 3   b -O—] n -CO—R 4 , C 2 -C 20 -alkenyl, C 2 -C 18 -acyl, C 4 -C 8 -cycloalkyl, where this may have OH substitution in the β-position, C 6 -C 10 -aryl, C 7 -C 10 -alkaryl or C 7 -C 10 -aralkyl, or, if  
 x=1, R 1  and R 2  may also, together with the N, form a closed ring having from 4 to 10 members, composed of carbon atoms and, where appropriate, of up to 2 heteroatoms, or if x=2, R 1  may also be C 2 -C 18 -alkylene which, at both β-carbon atoms, may have OH substitution and/or have interruption by one or more O atoms and/or one or more NR 2  groups, or be dihydroxy-substituted tetrahydrodicyclopentadienylene, dihydroxy-substituted ethylcyclohexanylene, dihydroxy-substituted 4,4′-(bisphenol A dipropyl ether)ylene, isophoronylene, dimethylcyclohexanylene, dicyclohexylmethanylene or 3,3′-dimethyldicyclohexylmethanylene, and if x=3, R 1  may also be trihydroxy-substituted (tri-N-propyl isocyanurate)triyl;  
 R 3   a  and R 3   b =independently of one another C 1 -C 22 -alkyl, C 2 -C 6 -alkenyl, C 6 -C 10 -aryl, H or CH 2 —X—R 5 , where X═O, S, —O—CO— or —CO—O—;  
 R 4 ═C 1 -C 18 -alkyl/alkenyl or phenyl; and  
 R 5 ═H, C 1 -C 22 -alkyl, C 2 -C 22 -alkenyl or C 6 -C 10 -aryl,  
 and/or  
 c) the salts of a) and b).  
 
     
     
         4 . The process of  claim 1  wherein the polymer thermal stabilizer mixture comprises at least 
 a) a perchlorate salt and/or  
 b) a reaction product of a mono- or polyfunctional epoxide and ammonia or, respectively, a mono- or polyfunctional dialkyl(aryl)- or monoalkyl(aryl)amine and/or  
 c) salts of a) and b).  
 
     
     
         5 . The process of  claim 4 , wherein the polyfunctional epoxide is dicyclopentadiene dioxide, vinylcyclohexene diepoxide, bishpenol A diglycidyl ether or trisglycidyl isocyanurate and the dialkylamine is diethanolamine or diisopropanolamine and the monoalkylamine is monoethanolamine or monoisopropanolamine.  
     
     
         6 . The process of  claim 3  wherein the perchlorate salt is a compound of the formula M(ClO 4 ) n , where M is H, Li, Na, K, Mg, Ca, Sr, Ba, Zn, Al, La, Ce or NH 4  and n is either 1, 2 or 3 as required by the valency of M.  
     
     
         7 . The process of  claim 3  wherein, in the compound having the general formula (I), R 3   a  and R 3   b , independently of one another, are H or CH 3  and y=1.  
     
     
         8 . The process of  claim 3  wherein, in the compound having the general formula (I), R 1 ═R 2 ═CH 2 —CHR 3 —OH.  
     
     
         9 . The process of  claim 6  wherein, in the perchlorate salt, M=Na or K and n=1.  
     
     
         10 . The process of  claim 3  wherein the compounds of the general formula (I) are selected from the group consisting of tris(2-hydroxy-1-propyl)amine, tris(2-hydroxy-ethyl)amine, bis(2-hydroxyethyl)-2-hydroxy-1-propylamine, alkyl/alkenylbis(2-hydroxyethyl)amine, alkyl/alkenyl(2-hydroxy-1-propyl)-amine, N-(2-hydroxyhexadecyl)diethanolamine,-2-hydroxy-3-octyloxypropyl)diethanolamine, N-(2-hydroxy-3-decyloxypropyl)diethanolamine, and mixtures of these.  
     
     
         11 . The process of  claim 3  wherein the polymer thermal stabilizer mixture is comprised of from 0.01 to 3.00 parts by weight of sodium perchlorate and/or from 0 to 8.00 parts by weight of alkanolamines of the general formula (I) and/or from 0.01 to 5.00 parts by weight of the salts of a) and b), per hundred parts of polymer.  
     
     
         12 . The process of  claim 1  further comprising the step of subsequently stabilizing the polymer using conventional stabilizers and/or additives.  
     
     
         13 . A composition comprising a polymer that has been prepared by the process of  claim 1 .  
     
     
         14 . A process for manufacturing useful articles comprising employing halogen-containing polymers prepared according to  claim 1 .  
     
     
         15 . An article of manufacture comprising a thermally stabilized halogen-containing polymer prepared by the process of  claim 1.