| 摘要 |
A curable silicone dental impression composition is presented, preferably comprising (A) a polyorganohydrogensiloxane having at least one silicon-bonded hydrogen atom; (B) a silicone polymer having at least two alkenyl groups; (C) a polysiloxane polyester polymer having at least one dimethicone-based polyoxyalkylene substituent, and at least one halogenated alkyl substituent; (D a catalyst; and (E) inorganic filler. The polysiloxane polymer has the general formula A-~-B-C-~x-A wherein x is an integer greater than 1, and such that the fluorine content of th e polysiloxane polyester is in the range from about 5% to about 30% by weight; wherein A is a fluorinated alkoxy group having the formula F3C(CF2)n(CH2)mOwherein n is an integer from 3 to 17 and m is an integer from 2 to 4; wherein B is dimer acid or a diacid; and wherein C is a dimethicone-based polysiloxane copolyol having the following formula: Me3Si--~-OSiMe2-~q--~OSiMeR1-~t--SiMe3 wherein Me is methyl, o is an integer in the range from 2 to 20, q is an integer in the range from 0 to 200, and R1 is a hydroxylated polyoxyalkylene substituent having the formula -(CH2)3O(AO)a(BO)b(CO)c-wherein the propyl group is linked to the silicone atom, and AO, BO, and CO are each independently linear or branched polyoxyalkylene groups having from 2 to 6 carbo ns, a and b are each independently integers in the range from 0 to 20, and c is an int eger in the range from 2 to 20. The use of the polysiloxane polymer of the present inven tion results in a dental impression material with optimal hydrophilicity, increased t ear strength and improved water adsorption.
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