Sealant for floor joints with a high resistance to fuels

Patent metadata

Field	Value
Publication number	US-2018334600-A1
Application number	US-201615777039-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Dec 21, 2015
Publication date	Nov 22, 2018
Grant date	—

Abstract

A polyurethane composition having a) 5 to 40 wt. %, based on the total polyurethane composition, of at least one polyol P; b) 25 to 75 wt. %, based on the total polyurethane composition, of at least one filler F; c) 0.5 to 10 wt. %, based on the total polyurethane composition, of at least one polyisocyanate I; and d) 10 to 40 wt. %, based on the total polyurethane composition, of at least one plasticizer W. The plasticizer W has at least one sulfonamide. Compositions according to the invention are suitable in particular as adhesives or sealants, in particular joint sealants, and have an excellent resistance against fuels.

First claim

1 . A polyurethane composition comprising
a) 5 to 40 wt %, based on the overall polyurethane composition, of at least one polyol P; b) 25 to 75 wt %, based on the overall polyurethane composition, of at least one filler F; c) 0.5 to 10 wt %, based on the overall polyurethane composition, of at least one polyisocyanate I; d) 10 to 40 wt %, based on the overall polyurethane composition, of at least one plasticizer W; wherein the plasticizer W comprises at least one sulfonamide.

2 . The polyurethane composition as claimed in claim 1 , wherein the composition is substantially free from asphalt, bitumen, or tar oils.

3 . The polyurethane composition as claimed in claim 1 , wherein the plasticizer W comprises or consists of N butylbenzenesulfonamide.

4 . The polyurethane composition as claimed in claim 1 , wherein the polyol P comprises or consists of at least one polyether polyol.

5 . The polyurethane composition as claimed in claim 1 , wherein the polyol P comprises or consists of at least one polyester polyol.

6 . The polyurethane composition as claimed in claim 1 , wherein the polyisocyanate I comprises monomeric, oligomeric and/or polymeric diphenylmethane diisocyanate (MDI) or tolylene diisocyanate (TDI).

7 . The polyurethane composition as claimed in claim 1 , wherein the composition comprises a single component, comprising
a) 5.5 to 50 wt %, based on the overall composition, of at least one isocyanate-functional polyurethane polymer PR, obtained from the at least one polyol P and the at least one polyisocyanate I; b) 10 to 40 wt %, based on the overall composition, of the at least one plasticizer W; c) 25 to 75 wt %, based on the overall polyurethane composition, of the at least one filler F; and d) 0 to 2 wt %, based on the overall polyurethane composition, of at least one catalyst for the crosslinking of polyurethanes.

8 . The polyurethane composition as claimed in claim 1 , wherein the composition comprises two components KA and KB, with the first component KA comprising the at least one polyol P, and the second component KB comprising the at least one polyisocyanate I.

9 . The polyurethane composition as claimed in claim 8 , comprising:
a first component KA, comprising: a) 10 to 50 wt %, based on KA, of the at least one polyol P; b) 10 to 50 wt %, based on KA, of the at least one plasticizer W; c) 25 to 75 wt %, based on KA, of the at least one filler F; d) 0 to 2 wt %, based on KA, of at least one catalyst for the crosslinking of polyurethanes; and a second component KB, comprising e) 10 to 100 wt %, based on KB, of the at least one polyisocyanate I; f) 0 to 60 wt %, based on KB, of the at least one plasticizer W; g) 0 to 60 wt %, based on KB, of the at least one filler F; with the mass mixing ratio of the two components KA:KB being between 8:1 and 12:1.

10 . A method comprising applying a polyurethane composition as claimed in claim 1 as adhesive or sealant.

11 . A method comprising bonding and/or sealing the substrate as claimed in claim 10 , comprising concrete.

12 . A method comprising, applying the substrate for bonding or sealing comprises a garage or a building of a filling station, of a tank farm, of a fuel container, or of an airport as claimed in claim 10 .

13 . A method comprising, applying a sealant for ground joints in civil engineering as claimed in claim 10 .

14 . A building or article of manufacture, especially comprising concrete, which has been bonded or sealed with a polyurethane composition as claimed in claim 1 .

15 . A cured polyurethane composition as claimed in claim 1 .

Assignees

• Sika Tech Ag

Inventors

• Schlumpf Michael

Classifications

• C08G18/4829 Primary

  Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C09J11/06

  organic · CPC title

• C08G18/7614

  containing only one aromatic ring · CPC title

• C04B41/63

  Macromolecular compounds · CPC title