Elastic sealing material on the basis of block copolymers made of isobutene and vinyl aromatic monomers
AssigneeBASF SE
InventorsHans Peter Rath, Arno Lange, Helmut Mach, Konrad Knoll
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Abstract
Linear or star block copolymers which have at least one polymer block A which is essentially composed of isobutene units and at least two polymer blocks B which are essentially composed of units which are derived from vinylaromatic monomers are used as resilient sealing material. In particular, such sealing materials are used for sealing the edge joints in insulation glass panes, and insulation glass panes have a flexible edge joint seal which contains one of the block copolymers.
Claims6
A method of sealing a joint by applying a resillient sealing material to the joint, wherein the sealing material consists of at least one linear or star block copolymer alone or together with customary additives for this purpose selected from processing assistants, UV stabilizers and fillers, in a amount of up to 40% by weight, wherein the block copolymer comprises at least one polymer block A which is essentially composed of isobutene units and at least two polymer blocks B which are essentially composed of units which are derived from vinylaromatic monomers and conform to the general formula I
- where
- A is a polymer block A,
- B is a polymer block B.
- n is 0, 1 or 2 and
- X is a single bond or an n+2-valent hydrocarbon radial of up to 30 carbon atoms,
- wherein the sum of the number-average molecular weights of all polymer blocks A is from 30,000 to 80,000 daltons,
- wherein each of the polymer blocks B has a number-average molecular weight Mn of from 6000 to 20,000 daltons, and
- wherein the ratio of the total weight of all polymer blocks A to the total weight of all polymer blocks B is from 3:2 to 4:1.
Dependencies are inferred from the claim text.