Reference

Scavengers for one-component alkoxy-functional RTV compositions and processes

Scavengers for one-component alkoxy-functional RTV compositions and processes. Dziark, John Joseph (General Electric Co., USA). PCT Int. Appl. WO 8302948 A1 1 Sep 1983, 136 pp. DESIGNATED STATES: W: AU, BR, DK, FI, JP, NO; RW: AT, BE, CH, DE, FR, GB, NL, SE. (English). (World Intellectual Property Organization). CODEN: PIXXD2. CLASS: IC: C08L083-02. APPLICATION: WO 82-US1477 18 Oct 1982. PRIORITY: US 82-349695 17 Feb 1982. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 29 A shelf-stable, one-package, substantially anhyd. and acid-free, room temp.There are some reagents like 143-16-8 is used in this study.-vulcanizable (RTV) organopolysiloxane compn., which is readily convertible to a tack-free elastomer comprises: (1) an alkoxy-terminated organopolysiloxane; (2) an effective amt. of a condensation catalyst; and (3) a stabilizing amt. of silane scavengers for unendcapped OH groups selected from the class consisting of Si-N compds. or Si-N polymers. Thus, a base compn. was prepd. by mixing methyldimethoxy-stopped polydimethylsiloxane (contg. 0.6 wt.% dihexylamine [143-16-8]) 100, octamethylcyclotetrasiloxane-treated fumed silica filler 16, trifunctional fluid (contg. 20 mol% monomethylsiloxy units, 76 mol% dimethylsiloxy units, and 4 mol% trimethylsiloxy units) 10, and trimethylsiloxy endstopped dimethylpolysiloxane (I) 20 parts. To 100 parts of the base compn. were added 0.3-0.67 part hexamethyldisilazane (II) [999-97-3] and 0.76 part I, the mixt. was stirred for 15 min, and then 4.6 part dibutyltin diacetate [1067-33-0] in I fluid was added to produce the RTV system. The RTV system was exposed to an atm. of 77 ± 5° F and 50 ± 5% relative humidity to produce a tack-free surface. The use of 0.67 part II produced a substantially shelf-stable compn., which was readily curable at ambient temps. .

Siloxylated metal-containing catalysts for urethane foams and elastomers

Siloxylated metal-containing catalysts for urethane foams and elastomers. Baskent, Feyyaz Omar; Reedy, James Dale (Union Carbide Corp. , USA). Eur. Pat. Appl. EP 84183 A2 27 Jul 1983, 34 pp. DESIGNATED STATES: R: AT, BE, CH, DE, FR, GB, IT, LI, LU, NL, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07F007-08; C07F007-22; C07F007-10; C07F003-12. ICA: C08G018-22; C08G018-24. APPLICATION: EP 82-112116 30 Dec 1982. PRIORITY: US 81-335612 30 Dec 1981. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 29, 37 Siloxylated metal-contg. catalysts for urethane foams and elastomers are prepd. by reaction of silylamines having the formula R4-nSi(NR1R2)n ( R is alkyl, alkaryl, alkenyl, alkynyl, aryl, cycloaliph., siloxy, or heteroatom substituted aliph., cycloaliph., or aryl group; R1 and R2 are H, alkyl, alkaryl, alkenyl, alkynyl, aryl, cycloaliph. or heteroatom substituted aliph., cycloaliph. or aryl groups; R1 and R2 cannot both be H; n = 1-4) with a metallic carboxylate having the formula M(OCOR3)xR4y (M is a metal with an oxidn. state; R3 and R4 are alkyl, alkaryl, alkenyl, alkynyl, aryl, cycloaliph. 87707-25-3 and 1600-27-7 are also in the experiment. or heteroatom substituted aliph., cycloaliph., or aryl group; x is at least 1 but no more than the oxidn. state of M ; y is equal to the oxidn. state of M minus x. The catalysts produce acceptable quality, cure, and desired cream rise profiles in foams, such as high-resilience, flexible, and rigid polyurethane foam, polyester foam, and reaction injection molding of urethane elastomers. The catalysts can also be prepd. in situ and have the same effect on foam properties. Thus, 0.168 mol Bu2Sn(OAc)2 [1067-33-0] reacted with 0.395 mol (dimethylamino)trimethylsilane [2083-91-2] at 80° for 2 h to give dibutylbis(trimethylsiloxy)stannane [86878-54-8]. Siloxylated Hg- and Pb-contg. catalysts were similarly prepd. .