| CPC C08G 77/045 (2013.01) [A61K 6/17 (2020.01); A61K 6/62 (2020.01); B33Y 70/00 (2014.12)] | 13 Claims |
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1. A photocurable composition consisting of:
i) 20% by weight to 55% by weight of a polymerizable core resin having 20 carbon atoms to 40 carbon atoms;
ii) 40% by weight to 70% by weight of a diluent resin miscible with said core resin, having up to two reactive terminal functional groups capable of covalently bonding to said core resin, or rheology modifier, or both; wherein the diluent resin has a viscosity of less than 1 Pa·s
iii) at least about 1% by weight of at least one rheology modifier, said rheology modifier being distinct from said diluent resin;
iv) photoinitiators; and
v) photostabilizers
wherein the rheology modifier is selected from:
(a) a compound of general formula I:
A-Pn Formula I
wherein A is a polyhedral oligomeric silsequioxanes cage (POSS);
P is a polymerizable terminal functional group capable of covalently bonding to said core resin, or said diluent resin, or both; and wherein P is, in each instance, independently selected from the group consisting of acrylates, methacrylates, and epoxides, optionally the polymerization terminal functional group P is linked to A via a linker group B, where B is present, B is absent of Si, and wherein n is an integer of 1 to 20; or
(b) a hybrid cage molecule that does not form covalent linkages with any of the components i) and ii).
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