Silane oligomer and radiation curable coating composition containing the oligomer
AssigneeDsm N.V.
InventorChander P. Chawla
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Abstract
The invention provides a silane-oligomer (A) of the following formula: (R.sup.3)--X--(R.sup.1.sub.x)--Y--Si(R.sup.2).sub.3 ( 1) wherein R.sup.3 is a group having a functionality that can be polymerized through actinic radiation, R.sup.1.sub.x is a backbone-oligomer having a molecular weight of more than about 200, R.sup.2 is a hydrolyzable group, and X and Y are coupling groups. The invention also provides a glass coating composition containing the silane-oligomer.
Claims25
A radiation-curable, optical glass coating composition formulated from:
- (A) 5-99% by weight of a silane-oligomer of the following formula:
- (R.sup.3)--X--(R.sup.1.sub.x)--Y--Si(R.sup.2).sub.3 ( 1)
- wherein
- R.sup.1.sub.x is a backbone containing carbon having a molecular weight of more than about 400 and less than about 10,000 and R.sup.1.sub.x is selected from the group consisting of polyolefins, polyethers, polyesters, polycarbonates, and mixtures thereof,
- R.sup.2 are hydrolyzable groups,
- R.sup.3 is a group having an actinic-radiation-induced polymerizable functionality, and
- X and Y are coupling groups containing urethane, urea, or thiourethane linkages,
- said silane-oligomer being substantially free of isocyanate groups;
- and
- (B) at least 1 wt. % of one or more reactive diluents which are each terminated with at least one end group that can react with said actinic-radiation-induced polymerizable functionality of said R.sup.3 group, said % by weight based on the total weight of said glass coating composition.
The glass coating composition according to claim 11, wherein said component (B) is present in an amount of from about 1 to about 60% by weight when component (B) comprises a reactive diluent which is terminated with only one end group that can react with said actinic-radiation-induced polymerizable functionality of said R.sup.3 group component, and said component (B) is present in an amount of from about 1 to about 35% by weight when component (B) comprises a reactive diluent which is terminated with at least two end groups that can react with said actinic-radiation-induced polymerizable functionality of said R.sup.3 group.
A radiation-curable optical glass fiber coating composition which when coated on optical glass fibers and suitably cured exhibits the combination of properties of adhesion to the glass optical fibers, stripability from the glass optical fibers, enhanced water resistance, and a low water soak, said coating composition in uncured form being formulated from:
- a silane-oligomer of the following formula:
- (R.sup.3)--X--(R.sup.1.sub.x)--Y--Si(R.sup.2).sub.3
- wherein
- R.sup.1.sub.x is a backbone containing carbon having a molecular weight of at least about 400 and less than about 10,000 and R.sup.1.sub.x is selected from the group consisting of polyolefins, polyethers, polyesters, polycarbonates, and mixtures thereof,
- R.sup.2 are hydrolyzable groups,
- R.sup.3 is a group having an actinic-radiation-induced polymerizable functionality, and
- X and Y are coupling groups containing a urethane, thiourethane, or urea linking group,
- said silane-oligomer being substantially free of isocyanate groups;
- and
- a reactive diluent carrying an end group that can react with said actinic-radiation-induced polymerizable functionality of said R.sup.3 group.
A radiation-curable optical glass fiber coating composition which when coated on optical glass fibers and suitably cured exhibits the combination of properties of adhesion to the glass optical fibers, stripability from the glass optical fibers, enhanced water resistance, and a low water soak, said coating composition in uncured form being formulated from:
- a silane-oligomer of the following formula:
- (R.sup.3)--X--(R.sup.1.sub.x)--Y--Si(R.sup.2).sub.3
- wherein
- R.sup.1.sub.x is a backbone containing carbon having a molecular weight of at least about 400 and less than about 10,000, and R.sup.1.sub.x selected from the group consisting of polyolefins, polyethers, polyesters, polycarbonates, and mixtures thereof
- R.sup.2 are hydrolyzable groups each independently selected from the group consisting of alkoxy, carboxy and alkoxy-ether groups,
- R.sup.3 is a group having an actinic-radiation-induced polymerizable functionality, and
- X and Y are each independently selected from the group consisting of coupling groups containing a urethane, urea, or thio-urethane linking group,
- said silane-oligomer being substantially free of isocyanate groups and said silane-oligomer having a molecular weight greater than about 500 and lower than about 11,000;
- and
- a reactive diluent carrying an end group that can react with said actinic-radiation-induced polymerizable functionality of said R.sup.3 group.
Dependencies are inferred from the claim text.