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1. 发明专利

DE4216923A1 Unsymmetrical siloxane(s) with stabiliser end Gps. and reactive end Gps. - useful as non-migrating, non-volatile, reactive stabilisers for polymers 未知
公开(公告)号：DE4216923A1
公开(公告)日：1993-11-25
申请号：DE4216923
申请日：1992-05-22
申请人： FRIEDRICH HOLGER , JANSEN IRENE DR , RUEHLMANN KLAUS PROF DR
发明人： FRIEDRICH HOLGER , JANSEN IRENE DR , RUEHLMANN KLAUS PROF DR
IPC分类号： C07F7/08 , C08G77/04 , C08G77/16 , C08G77/26 , C07C7/08 , C07C7/10 , C08G77/06
摘要： A process for the prodn. of unsymmetrical siloxanes of formula (I) comprises (a) converting a silane of formula R-Z-SiR1R2R6 (II) into a silanol of formula R-Z-0SiR1R2-OH (III), (b) reacting with Li or a Li cpd. such as n-BuLi, MeLi or LiH to form a silanolate of formula R-Z-SiR1R2-OLi (IV), then (for siloxanes with n greater than 0) (c) reacting (IV) in aprotic dipolar solvent, pref. THF, first with hexamethyl cyclotrisiloxane at 20-70 deg. C and then (d) with a cpd. of formula X-SiR1R4-Y (V) or X-Si(R3)i(R4)j(OR5)3-i-j (VI) and then cleaving trimethylsilyl protective gps. by alcoholysis or hydrolysis; or reacting with Cl-SiMe2-H and then with a cpd. of formula CH2=CH-(CH2)m-2-R7 (VII) or allyl glycidyl ether in the presence of a hydrosilylation catalyst and then cleaving any Me3Si gps. as above; or reacting with 2,2-dimethyl -1-oxa-2-sila -cyclopentane and acetic acid. In the formulae, n = 0-100; R = sterically hindered phenol or amine residue (R1) or (R2) (with R' = H, alkyl or aryl, pref. tert.-Bu in R1 or Me in R2); Z = -O(CH2)k- (with k = 3-20), -CH2CH2-, -CHMe- or -OCO-(CH2)1- (with 1 = 2-20); R1, R2 = alkyl or aryl; M = SiR3R4H, -Si(R3)i(R4)j(OR5)3-o-j, -SiR3R4(CH2)mOH, -SiR3R4(CH2)mNH2, -SiR3R4CH=CH2, or -SiR3R4(CH2)3-O-glycidyl (with R3-R5 = alkyl or aryl; im j = 0 or 1; m = 3-10); R6 = Cl, Br, acetoxy, alkoxy or aryloxy; X = Cl, Br or acetoxy; Y = H, -(CH2)mOSiMe3 (with m = 3010), -CH=CH2 or glycidoxypropyl. USE/ADVANTAGE - Used as reactive stabilisers for polymers. (I) contain stabiliser gps. (R) and reactive end gps. which enable (I) to be incorporated into the polymer structure; i.e. (I) are stabilisers with high extn. stability, low volatility, good polymer compatibility and high mobility in the polymer. Suitable end gps. include Si-H (for use in polydienes), Si(CH2)3OH (for reaction with COCl or NCO gps. in polyesters or polyurethanes, Ci(CH2)3NH2 (for incorporation in polyamides or polyureas) etc.

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