| 摘要 |
#CMT# #/CMT# A method for the production of organofunctional organosiloxanes with saturated or unsaturated acyloxy groups attached to silicon, involves reacting the corresponding halo-organosiloxane with an acyloxysilane. #CMT# : #/CMT# A method for the production of organofunctional organosiloxanes of formula (I) involves reacting organosiloxanes of formula (II) with silanes of formula (III). (SiO 4/2) k(R 1> aR n> 1-aSiO 3/2) m(R 1> bR n> 2-bSiO 2/2) p(R 1> cR n> 3-cSiO 1/2) q(I) (SiO 4/2) k(R 1> aX 1-aSiO 3/2) m(R 1> bX 2-bSiO 2/2) p(R 1> cX 3-cSiO 1/2) q(II) R 11> 4-vSi(OCOR 2>) v(III) R 1>, R 11>H, 1-20C hydrocarbyl or 1-15C hydrocarbyloxy (both optionally substituted with CN, NCO, N(R x>) 2, halogen, epoxy or -CON(R x>) 2and optionally with one or more non-adjacent CH 2groups replaced by O, CO, COO, OCO, OCOO, S or NR x>and/or with one or more non-adjacent CH groups replaced by -N=, -N=N- or -P=); R n>-OCOR 2>; X : F, Cl, Br or I; R x>H or 1-10C hydrocarbyl (optionally substituted with CN or halogen); R 2>H, or saturated or unsaturated 1-20C hydrocarbyl (optionally substituted with CN or halogen); a : 0 or 1; b : 0, 1 or 2; c : 0, 1, 2 or 3; v : 1, 2, 3 or 4; p : a whole number (at least 1); (k+m+p+q) : at least 2; at least one group R n>is present in (I) and at least one X is present in (II) . An independent claim is included for a method for the production of liquid organosiloxanes of formula (IV) by reacting organosiloxanes of formula (V) with silanes (II) as above. (R 1> 2SiO 2/2) p(R 1> 3SiO 1/2) 1(O 1/2R 1> 2SiOCOR 2) 1(IV) (R 1> 2SiO 2/2) p(R 1> 3SiO 1/2) 1(O 1/2R 1> 2SiX) 1(V) p : 1-20000 . #CMT#USE : #/CMT# Organofunctional organosiloxanes obtained by this method are used, e.g. as photo-crosslinkable coatings for making non-stick layers, for making hard and soft contact lenses and as components of antifouling coatings. #CMT#ADVANTAGE : #/CMT# Enables the production of organofunctional organo-siloxanes in high purity, while maximising yields and ensuring good product quality. #CMT#DEFINITIONS : #/CMT# Preferred Definitions: R n>acetyl, acryloyl or methacryloyl; (k+m+p+q+s+t) : 3-100; R 1>, R 1> 1>methyl, ethyl, phenyl, vinyl or trifluoropropyl . #CMT#EXAMPLE : #/CMT# A mixture of 1080 g chlorotrimethylsilane (CTMS), 444 g hexamethyl-cyclotrisiloxane and 3 g methyltrioctylammonium chloride was stirred for 2 hours at 55[deg] C. GC analysis showed complete conversion to the required chloro-nonamethyl-tetrasiloxane; the unreacted CTMS (intentional excess) was left in the product. The mixture obtained (784 g) was mixed with 700 ml toluene and 190 g methacryloxytrimethyl silane (MATMS) and reacted for 3 hours at 105[deg] Cwith continuous distillation of CTMS, then excess CTMS, MATMS and solvent were removed on a rotary evaporator. Vacuum distillation gave 327 g methacryloxy-nonamethyl-tetrasiloxane with a GC purity of 97.3% (yield= 85%). |
