Two-component polysulphide adhesive/sealant
View Patent ↗The use of benzoate plasticizers in two-component insulating glass adhesives/sealants based on polysulfide polymers or polymercaptan polymers enables simpler production due to the low viscosity thereof. Improved miscibility of the two components and an improved rate of curing are observed. In addition, the use of phthalate plasticizers, which may possibly cause an endocrinal effect in humans and animals, is avoided.
1. A two-component insulating glass adhesive and sealant comprising a binder component (A) and a separate curing component (B), wherein:
(A) the binder component comprises:
(i) 15 to 35 wt. % of liquid polysulfide or liquid polymercaptan polymer or a mixture thereof,
(ii) 5 to 20 wt. % of at least one benzoate plasticiser,
(iii) 30 to 65 wt. % of fillers,
(iv) 0.1 to 7 wt. % of a silane adhesion promoter; and
(B) the curing component comprises:
(i) 20 to 45 wt. % of at least one benzoate plasticiser,
(ii) 0.1 to 40 wt. % of at least one copolymer,
(iii) 10 to 40 wt. % of an oxidising agent,
(iv) 1 to 15 wt. % of accelerator, and
(v) 15 to 35 wt. % of fillers.
2. An insulating glass adhesive and sealant according to claim 1 which is essentially free of phthalate plasticiser.
3. An insulating glass adhesive and sealant according to claim 1 wherein the oxidising agent (iii) of the curing component (B) is selected from one or more of a group consisting of calcium peroxide, lead dioxide, zinc peroxide, manganese dioxide or cumene hydroperoxide.
4. An insulating glass adhesive and sealant according to claim 1 wherein the benzoate plasticiser in components (A) or (B) is independently selected from the benzoic acid esters of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, 2,2,4-trimethyl-1,3-pentanediol, neopentyl glycol hydroxypivalate or mixtures thereof.
5. An insulating glass adhesive and sealant according to claim 1 wherein the at least one copolymer (ii) of component (B) comprises ethylene/vinyl acetate copolymers or vinylchloride/vinyl acetate copolymers.
6. An insulating glass adhesive and sealant according to claim 1 wherein the at least one benzoate plasticiser of component (A)(ii) and component (B)(i) are identical and is a benzoate plasticiser having a low viscosity.
7. An insulating glass adhesive and sealant according to claim 1 having a Shore hardness of 40 or less after mixing of components (A) and (B) and curing for 2 hours at 23° C.
8. A process for producing an insulating glass adhesive and sealant according to claim 1 comprising mixing the at least one benzoate plasticiser of component (B) with the copolymer of component (B) and thereafter combining the resulting mixture with the other constituents of component (B).
9. A process according to claim 8 wherein the weight ratio of benzoate plasticiser to copolymer is from 40.1 to 40:0.1.
10. A process according to claim 9 wherein the mixing temperature is from 70° C. to 140° C.
11. A process according to claim 8 wherein the resulting insulating glass adhesive and sealant is essentially free of phthalate plasticiser.
12. A process according to claim 8 wherein the benzoate plasticiser in components (A) or (B) is independently selected from the benzoic acid esters of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, 2,2,4-trimethyl-1,3-pentanediol, neopentyl glycol hydroxypivalate or mixtures thereof.
13. A process according to claim 8 wherein the resulting insulating glass adhesive and sealant has a Shore hardness of 40 or less after mixing of components (A) and (B) and curing for 2 hours at 23° C.
14. A process for preparing an adhesive composition comprising:
obtaining components A and B according to claim 1 ; and
mixing said components.
15. The process of claim 14 wherein said adhesive composition is essentially free of phthalate plasticizer.
16. A process for insulating glass comprising:
obtaining components A and B according to claim 1 ;
mixing component A with component B to produce a mixture; and
applying the mixture to the glass.
17. The process of claim 16 wherein said components are essentially free of phthalate plasticizer.