Stabilizers and antiozonants for elastomers

C - Chemistry – Metallurgy – 08 – K

Patent

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C08K 5/372 (2006.01) C07C 317/18 (2006.01) C07C 317/28 (2006.01) C07C 317/44 (2006.01) C07C 323/11 (2006.01) C07C 323/25 (2006.01) C07C 323/52 (2006.01) C08K 5/41 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2382126

Elastomers which have excellent stability to prevent oxidative, thermal, dynamic, light-induced and/or ozone-induced degradation comprise, as stabilizers, at least one compound of the formula (I): [R-S(=O)m-CH2-CH(OH)- CH2]n-N(R1)2-n-R2, in which R is C4-C20alkyl, hydroxyl-substituted C4- C20alkyl; phenyl, benzyl, .alpha.-methylbenzyl, .alpha.,.alpha.- dimethylbenzyl, cyclohexyl or -(CH2)qCOOR3, and, if m is 0, R may additionally be (a); and, if n is 1 and R4 is hydrogen, R may additionally be R2-R1N-CH2- CH(OH)-CH2-S(=O)m-(CH2)x- or R2-R1N-CH2-CH(OH)-CH2-S(=O)m-CH2-CH2-(O-CH2-CH2)y- , R1 is hydrogen, cyclohexyl or C3-C12 alkyl, R2 is (b), R3 is C1-C18alkyl, R4 is hydrogen or -CH2-CH(OH)-CH2-S(=O)m-R, X is C1-C8alkyl, Y is C1-C8alkyl, m is 0 or 1, n is 1 or 2, q is 1 or 2, x is from 2 to 6, and y is 1 or 2. The compounds of the formula (I) are also suitable as stabilizers for elastomers to prevent contact discoloration of substrates coming into contact with elastomers.

L'invention concerne des élastomères présentant une excellente stabilité servant à empêcher la détérioration par oxydation, la détérioration thermique, la détérioration dynamique, la détérioration par la lumière et/ou par l'ozone, comprenant, comme agents stabilisants, au moins un composé représenté par la formule (I): [R-S(=O)¿m?-CH¿2?-CH(OH)-CH¿2?]¿n?-N(R?1¿)¿2-n?-R?2¿, dans laquelle R est alkyle C¿4?-C¿20?, alkyle C¿4?-C¿20? substituté en hydroxy; phényle, benzyle, .alpha.-méthylbenzyle, .alpha.,.alpha.-diméthylbenzyle, cyclohexyle ou -(CH¿2?)¿q?COOR?3¿, et, si m est 0, R peut également être (a); et, si n est 1 et R?4¿ est hydrogène, R peut également être R?2¿-R?1¿N-CH¿2?-CH(OH)-CH¿2?-S(=O)¿m?-(CH¿2?)¿x?- ou R?2¿-R?1¿N-CH¿2?-CH(OH)-CH¿2?-S(=O)¿m?-CH¿2?-CH¿2?-(O-CH¿2?-CH¿2?)¿y?-, R?1¿ est hydrogène, cyclohexyle ou alkyle C¿3?-C¿12?, R?2¿ est (b), R?3¿ représente alkyle C¿1?-C¿18?, R?4¿ est hydrogène ou -CH¿2?-CH(OH)-CH¿2?-S(=O)¿m?-R, X représente alkyle C¿1?-C¿8?, Y représente alkyle C¿1?-C¿8?, m est 0 eu 1, n est 1 ou 2, q est 1 ou 2, x est compris entre 2 et 6, et y est 1 ou 2. Les composés de la formule (I) conviennent également comme agents stabilisants pour des élastomères; ils permetttent d'empêcher la réaction colorante par contact de substrats entrant en contact avec des élastomères.

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