| 摘要 |
<p>Polymerisable compositions comprise (a) a compound containing (i) at least one acryloyloxy or methacryloyloxy group, (ii) at least one allyl, methallyl, or 1-propenyl group attached, either directly, or through an oxygen atom or an oxycarbonyl group, to a carbon atom which forms part of an aromatic or cycloaliphatic nucleus, (b) a compound containing in the molecule both (iii) at least one acryloyloxy or methacryloyloxy group and (iv) at least one -COOH group, and (c) a compound containing at least two mercaptan groups directly attached to aliphatic carbon atoms. Examples of (a) are 2,2-bis(3-allyl-4-(3-(methacryloyloxy)-2-(2 carboxyethylcarbonyloxy)propoxy)phenyl)propane, 1-(allyloxycarbonyl)-2,4-bis(3-(methacryloyloxy)-2-(2-carboxyethyl-carbonyloxy)propoxycarbonyl)benzene, and diallyl bis(3-methacryloyloxy)-2-(2-carboxyethylcarbonyloxy)propyl) esters of benzophenone-3,4,3',4'-tetracarboxylic acid. Examples of (b) are acrylic acid and 2-(methacryloyloxy)ethyl 5-carboxycyclohex-1-ene-4-carboxylates. Examples of (c) are pentaerythritol tetrathioglycollate, trimethylolpropane trithioglycollate, and 3,6-dioxa-1,8-dimercapto-octane. The compositions may be polymerised by means of actinic irradiation in the presence of an added or "built-in" photosensitiser or by the action of a free-radical catalyst. They are especially useful in the production of printed circuits.</p> |
