Two-part polyurethanes based on hyperbranched polymers
AssigneeSika Technology AG
InventorsShuyuan Liu, Neil Carter, Len Daniels
Life of this patent
Estimating the term…
Abstract
A two-part polyurethane composition including a first pack and a second pack. The first pack includes at least one hyperbranched copolymer having OH groups and which is prepared from at least one or more monomer(s) having at least two unsaturated C—C bonds and one or more monomer(s) having one unsaturated C—C bond and one hydroxyl group in the presence of a cobalt (II) complex. The second pack comprises at least one polyisocyanate. Disclosed is a two-part polyurethane composition which has low viscosity, long pot life, fast cure, excellent weathering and UV resistance and which is suitable for use as a coating.
Claims30
A two-part polyurethane composition, comprising a first pack (C1) and a second pack (C2), wherein
- the first pack (C1) comprises:
- at least one hyperbranched copolymer (HBC) having OH groups, wherein the at least one hyperbranched copolymer is prepared from at least
- a) one or more monomer(s) having at least two unsaturated C—C bonds (M2), and
- b) one or more monomer(s) having one unsaturated C—C bond and one hydroxyl group (MH),
- in the presence of a cobalt (II) complex (CC), and
- the second pack (C2) comprises at least one polyisocyanate (PI),
- wherein the first pack (C1) and the second pack (C2) are separate packs, and contents of the first pack (C1) are stored separately from contents of the second pack (C2),
- wherein the at least one hyperbranched copolymer (HBC) is not prepared from a mercapto compound-containing chain transfer agent.
A two-part polyurethane composition, comprising a first pack (C1) and a second pack (C2), wherein
- the first pack (C1) comprises:
- at least one hyperbranched copolymer (HBC) having OH groups, wherein the at least one hyperbranched copolymer is prepared from at least
- a) one or more monomer(s) having at least two unsaturated C—C bonds (M2), and
- b) one or more monomer(s) having one unsaturated C—C bond and one hydroxyl group (MH),
- in the presence of a cobalt (II) complex (CC), and
- the second pack (C2) comprises at least one polyisocyanate (PI),
- wherein the first pack (C1) and the second pack (C2) are separate packs, and contents of the first pack (C1) are stored separately from contents of the second pack (C2),
- wherein the hyperbranched copolymer (HBC) is prepared from:
- a) the one or more monomer(s) having at least two unsaturated C—C bonds (M2),
- b) the one or more monomer(s) having one unsaturated C—C bond and one hydroxyl group (MH), and
- c) one or more monomer(s) having one unsaturated C—C bond (M1),
- in the presence of a non-peroxide initiator (IN) and the cobalt (II) complex (CC).
A two-part polyurethane composition, comprising a first pack (C1) and a second pack (C2), wherein
- the first pack (C1) comprises:
- at least one hyperbranched copolymer (HBC) having OH groups, wherein the at least one hyperbranched copolymer is prepared from at least
- a) one or more monomer(s) having at least two unsaturated C—C bonds (M2), and
- b) one or more monomer(s) having one unsaturated C—C bond and one hydroxyl group (MH),
- in the presence of a cobalt (II) complex (CC), and
- the second pack (C2) comprises at least one polyisocyanate (PI),
- wherein the first pack (C1) and the second pack (C2) are separate packs, and contents of the first pack (C1) are stored separately from contents of the second pack (C2),
- wherein the amount of polyisocyanate (PI) is present in such an amount that a ratio of a number hydroxyl groups present in the first pack (C1) to a number of isocyanate groups present in the second pack (C2) is a value between 0.9 and 1.1.
Dependencies are inferred from the claim text.