| abstract |
A chemical gel comprising at least one silicon-containing biostable polymer having monomers with an average functionality in the range of 2.05 to 3.5, wherein the biostable polymer is a polyurethane or polyurethane urea which is a product of reaction of: (a) at least one silicon-containing polyol or polyamine having 2 or more functional groups, wherein the silicon-containing polyol or polyamine (a) is a compound of formula (I), (II), ( III) or (IV) ** Formula ** in which R1 and R2 are independently selected from C1-6 alkylene optionally substituted with OH or NR'R '' in which R 'and R' 'are independently selected from H, CO2H and C1-6 alkyl; R3 to R8 are independently selected from C1-6 alkyl and C1-6 alkylene which may be optionally interrupted by O and optionally substituted with OH or NR'R '' in which R 'and R' 'are as defined above; R9 is C1-4 alkyl; R10 is optionally substituted C1-4 alkyl or ** Formula ** in which R1 and R9 are as defined above; x is 5 to 30. |