Adhesive method using two-component adhesives based on compounds having cyclothiocarbonate units
AssigneeBASF SE
InventorsUlrike Licht, Peter Rudolf, Markus Jegelka, Indre Thiel, Karl-Heinz Schumacher
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Abstract
A bonding process is described in which two substrates are bonded together by applying to the surface of at least one of the substrates a curable, not yet cured 2-component adhesive that comprises, in a first component, a compound A having at least one defined cyclic thiocarbonate unit having a five-membered ring structure and, in a second component, a curing compound B selected from compounds having at least one functional group selected from primary amine groups and secondary amine groups.
Claims23
A bonding process in which two substrates are bonded together by applying to a surface of at least one of the substrates a curable, not yet cured, liquid adhesive that
- (a) in a first component comprises at least one compound A;
- and
- (b) in a second component comprises at least one curing compound B selected from compounds having at least one functional group selected from primary amine groups and secondary amine groups, and wherein the first component, the second component, and/or a further component of the adhesive comprises at least one compound C that has at least one functional group reactive with an —SH group, wherein the at least one functional group has an ethylenically unsaturated bond,
- wherein the substrates being bonded are the same or different from one another and are selected from the group consisting of metal, wood, glass, plastic shaped bodies, plastic films, paper, and paperboard,
- wherein at least two of the at least one compounds A, B, and C are polyfunctional, and
- wherein the at least one compound A has the formula (I)
- where R1 to R4 are independently hydrogen or an organic group having up to 50 carbon atoms;
- one of the groups R1 to R4 being a linking group to Z, n is an integer greater than or equal to 1, and Z is hydrogen or an n-valent organic group.
A curable adhesive composition that
- (a) in a first component comprises at least one compound A having a molecular weight greater than 1000 g/mol;
- and
- (b) in a second component comprises at least one curing compound B selected from compounds having at least one functional group selected from primary amine groups and secondary amine groups,
- and wherein the first component, the second component, and/or a further component of the adhesive composition comprises at least one compound C that has at least one functional group reactive with an —SH group, wherein the at least one functional group has an ethylenically unsaturated bond,
- wherein at least two of the at least one compounds A, B, and C are polyfunctional, and
- wherein the at least one compound A has the formula (I)
- where R1 to R4 are independently hydrogen or an organic group having up to 50 carbon atoms;
- one of the groups R1 to R4 being a linking group to Z, n is an integer greater than or equal to 1, and Z is hydrogen or an n-valent organic group,
- wherein the curing compound B is used in an amount such that the amount na of functional groups in curing compound B is from 80 mol % to 120 mol %, based on the amount nA of cyclic thiocarbonate groups in compound A, and wherein compound C is used in an amount such that the amount of double bonds nos reactive toward SH groups is from 90 to 110 mol %, based on the amount nA of cyclic thiocarbonate groups.
Dependencies are inferred from the claim text.