Curable composition for alkaline substrates
AssigneeSika Technology AG
InventorsAndreas Kramer, Urs Burckhardt
Life of this patent
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Abstract
Methods of using a curable composition, the curable composition including at least one polyether having blocked hydroxyl groups as the plasticizer on at least one alkaline substrate. The curable composition is storage-stable, easy to handle and highly elastic after curing, and does not show any tendency to separate or migrate. It enables elastic bonding, sealing or coating of alkaline substrates, such as, in particular, fresh or green concrete or cement mortar, without occurrence of troublesome odors triggered by plasticizer hydrolysis.
Claims13
A method comprising:
- contacting a curable composition comprising at least one polyether having blocked hydroxyl groups as plasticizer with a surface of at least one alkaline substrate, the surface of the alkaline substrate being configured such that when the surface is wetted with water the pH of the water-wetted alkaline substrate surface is at least 10,
- wherein the at least one polyether having blocked hydroxyl groups is derived from at least one hydroxy-functional polyether selected from the group consisting of polyoxypropylene diols having an OH number in the range from 12 to 155 mg KOH/g and the blocked hydroxyl groups are both acetate groups, and
- the curable composition comprises at least one polymer containing isocyanate and/or silane groups.
A method of bonding or sealing or coating, comprising the steps of:
- (i) providing a curable composition, the curable composition comprising at least one polyether having blocked hydroxyl groups as plasticizer, wherein the at least one polyether having blocked hydroxyl groups is derived from at least one hydroxy-functional polyether selected from the group consisting of polyoxypropylene diols having an OH number in the range from 12 to 155 mg KOH/g and the blocked hydroxyl groups are both acetate groups, and
- (ii) providing at least one alkaline substrate, the surface of the alkaline substrate being configured such that when the surface is wetted with water the pH of the water-wetted alkaline substrate surface is at least 10,
- (iii) contacting the curable composition with the alkaline substrate, and
- (iv) curing the composition to form a cured composition, wherein
- the curable composition comprises at least one polymer containing isocyanate and/or silane groups.
Dependencies are inferred from the claim text.