| 摘要 |
Photoinitiator for cationic polymerisation comprises salts of organometallic complexes grafted on a polyorganosiloxane squelette and are of formula (I), where m = 0.5-50; n = 0-500; p = 0-50; m=n = at least 2; R<1> = opt. branched 1-6C alkyl or phenyl; A = organometallic salt residue of formula (L<1>L<2>M)<+>q.qX<-> (II). M = gp. 4-10 metal; L<1> = 1 or 2 ligands bonded to M by bond and comprising eta <3>-allylalkyl, eta <5>-cyclopentadienyl or eta <7>-cycloheptatrienyl or opt. substd. eta <6>-benzene cpds. or cpds. having 2-4 condensed rings, each ring capable of contributing to the valency or M by 3-8 electrons; L<2> = 0-3 ligands bonded to M by sigma electrons and comprising CO or NO2; X = BF4, PF6, AsF6 and/or SbF6; q = 1 or 2; R<2> = (1) 2-6C opt. branched alkylene; (2) gp. of formula -R<3>-O-R<4>-; (3) alkylene-cyclohexylene gp. where the alkylene has 2-4C and is opt. branched and the cyclohexylene has an OH gp. and opt. 1-2 1-3 C alkyl substits.; or (4) gp. of formula -R<5>-O-R<6>-; R<3>,R<4>,R<5>,R<6> = opt. branched 1-6C alkylene; R<6> is bonded to Z and the two gps. are opt. substd. by OH; Z = silyl of formula -Si(R<7>)2- when R<2> is as (1) or (2); and Z = silyl of formula -Si(R<7>)2- when R<2> is as (1) or (2); and Z = -O-CO- when R<2> is as (3) or (4); R<7> = 1-6C opt. branched alkyl; B = carried gp. for an epoxy; when R<2> is as (1) or (2) and Z is Si(R<7>)2-, p is 0; and when R<2> is as (3) or (4) and Z is -O-CO-, p is 0 or a positive number and B is a precursor of R<2> having an epoxy gp. at the end furthest from the end bonded to Si. Also claimed are: (i) the prepn. of the cpds. (see PREPARATION); (ii) polyorganosiloxane compsns. which are crosslinkable under cationic conditions, by photochemistry or electrons comprising 100 pts.wt. of a polyorganosiloxane having epoxy functional gps., the above cpd. (I) and 0-50 pts.wt. of conventional additives; and (iii) a process for rendering articles non-adherent to surfaces to which they normally adhere involving applying 0.1-5 g/m<2> of the compsn. in (ii) and crosslinking. |
