Polymer and compositions
There are disclosed urethane acrylates of Formula 1: where R 1a , R 1b and R 1c each independently represent C 2-15 hydrocarbylene, preferably linear C 3-12 alkylene (such as, C 4-8 alkylene; e.g. hexylene); a isophorone unit and/or a tolyl unit. R 2a , R 2b and R 2c each independently represent: a divalent moiety of (Formula 2) where X and Y independently represent C 2-10 hydrocarbylene, preferably C 2-8 alkylene; and k is from 0 to 30; l is from 0 to 30; and ‘k+l’ is from 1 to 30; and/or a divalent moiety of Formula 3 where V and W independently represent C 2-10 hydrocarbylene, preferably C 2-8 alkylene; and i is from 0 to 30; j is from 0 to 30; and ‘i+j’ is from 1 to 30; p is from 1 to 10; and r is from 1 to 10; and R 3a R 3b and R 3c each independently represent H or methyl (i.e. R 3 forms respectively part of an acrylate or a methacrylate group); with the provisos that at least one of R 2a , R 2b and R 2c is a moiety of Formula 2; at least one of R 2a , R 2b and R 2c is a moiety of Formula 3; and when R 2 represents a divalent moiety of Formula 3, the sub moiety within Formula 3, is attached directly to the amide group in Formula 1. The UAs of Formula 1 are of non crystalline and of low viscosity and are suitable for preparing polymeric flexibilizers suitable for tenting applications. A process for preparing these urethane acrylate is also described.
1. A urethane acrylate represented by Formula 1:
where
R 1a , R 1b and R 1c each independently represent C 2-15 hydrocarbylene;
R 2a , R 2b and R 2c each independently are selected from the group consisting of:
a divalent moiety of Formula 2
where X and Y independently represent C 2-10 hydrocarbylene and
k is from 0 to 30; l is from 0 to 30; and ‘k+l’ is from 1 to 30; and
a divalent moiety of Formula 3
wherein V and W independently represent C 2-10 hydrocarbylene; and
i is from 0 to 30; j is from 0 to 30; and ‘i+j’ is from 1 to 30;
p is from 1 to 10; and
r is from 1 to 10;
R 3a R 3b and R 3c each independently represent H or methyl;
with the provisos that:
at least one of R 2a , R 2b and R 2c is a moiety of Formula 2;
at least one of R 2a , R 2b and R 2c is a moiety of Formula 3; and
wherein the sub-moiety
within Formula 3, is attached directly to the amide group in Formula 1.
2. A urethane acrylate as claimed in claim 1 , in which
R 1a , R 1b and R 1c each independently represent
a linear C 2-15 alkylene, and/or a C 3-15 hydrocarbylene comprising a cyclic ring;
R 2a , R 2b and R 2c each independently represent:
a moiety of Formula 2 where:
k is from 0 to 20; 1 is from 0 to 20 and ‘k+l’ is from 1 to 20; and/or
a moiety of Formula 3 where:
i is from 0 to 20; j is from 0 to 20, and ‘i+j’ is from 1 to 20; and
r is from 1 to 8; and p is from 3 to 6.
3. A urethane acrylate as claimed in claim 2 , in which Formula 2 is a divalent moiety of Formula 2a
where m is from 2 to 12 and
Formula 3 is a divalent moiety of Formula 3a
where n is from 1 to 8.
4. A urethane acrylate as claimed in claim 1 , having a weight average molecular weight (M w ) of from about 3000 to about 6000 daltons.
5. A urethane acrylate as claimed in claim 1 , having a viscosity of less than about 30,000 mPa·s.
6. A urethane acrylate as claimed in claim 5 , having a viscosity of, less than about 20,000 mPa·s.
7. A urethane acrylate as claimed in claim 5 , having a viscosity of, less than about 12,000 mPa·s.
8. A process for preparing a urethane acrylate as described in claim 1 , the process comprising the step of reacting together
(a) Component A comprising at least one C 2-15 hydrocarbyl diisocyanate isocyanurate;
(b) Component B comprising at least one compound of Formula 2b
where X, Y, k and l are as denoted in claim 1 for Formula 2, and R 7 and R 8 are (meth)acrylate groups which are optionally the same;
(c) Component C comprising at least one compound of Formula 3b
where V, W, i, j, p and r are as denoted in claim 1 for Formula 3, and R 9 and R 10 are (meth)acrylate groups which are optionally the same.