Polyurethane sealant

Patent metadata

Field	Value
Publication number	US-10280248-B2
Application number	US-201415035000-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Nov 8, 2013
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

The present invention relates to a process for producing a polyurethane sealant, which comprises mixing (a) polyisocyanate, (b) polyetherpolyols, (c) aliphatic, exclusively amine initiated alkoxylation products having an OH-number of 400 to 1000 mg KOH/g and a functionality of 4, (d) blowing agents and optionally (e) chain extenders and/or crosslinking agents, (f) catalysts and (g) auxiliaries and/or additives to give a reaction mixture and reacting the reaction mixture to give the polyurethane sealant. The present invention further relates to a cast in place polyurethane sealant, obtained according to a process according to the present invention.

First claim

The invention claimed is:

1. A process for producing a polyurethane cast in place sealant, comprising:
mixing only
a) polyisocyanate,
b) polyetherpolyols,
c) aliphatic, exclusively amine initiated alkoxylation products having an OH-number of 400 to 1000 mg KOH/g and a functionality of 4,
d) blowing agents, and optionally
e) chain extenders and/or crosslinking agents,
f) catalysts, and
g) auxiliaries and/or additives consisting of a surface-active substance, a flame retardant, a reinforcing material, a bonding agent, a UV stabilizer, an antioxidant, a dye, a pigment, a hydrolysis inhibitor, and/or a fungistatic and bacteriostatic substance

to give a reaction mixture,
applying the reaction mixture to a carrier, and
reacting the reaction mixture to give the polyurethane cast in place sealant having a density of 80 to 600 g/liter,
wherein
the auxiliaries and/or additives (g), when present, has 2 to 10 wt %, based on a total weight of components (b) to (f), fumed silica as a reinforcing material,
the polyetherpolyols (b) have an average functionality of 2.0 to 3.5 and an average hydroxyl number of 20 to 80,
a content of the catalysts (f), when present, ranges from 0.1 to 1% by weight based on a total weight of components (a) to (f),
in the reaction mixture, a ratio of NCO groups in the polyisocyanate (a) to a sum of isocyanate-reactive hydrogen atoms in the components (b) and optionally (c) and (d) is from 0.5:1 to 0.8:1,
a content of the aliphatic amine initiated alkoxylation product (c) is 0.5 to 10 wt %, based on the total weight of the components (b) to (f), and
the polyurethane cast in place sealant has a shore hardness of less than 20 shore A.

2. The process according to claim 1 , wherein the aliphatic amine initiated alkoxylation product (c) is an alkoxylation product of ethylendiamine in the presence of an alkoxylation agent.

3. The process according to claim 2 , wherein the alkoxylation agent is 1,2-propyleneoxide.

4. The process according to claim 1 , wherein the density of the cast in place sealant is 100 to 400 g/liter.

5. The process according to claim 1 , wherein the blowing agent comprises water.

6. The process according to claim 1 , wherein components (a) to (e) are mixed at a temperature of form 15 to 70° C.

7. The process according to claim 1 , wherein the polyetherpolyols (b) comprise polymer polyol.

8. The process according to claim 1 , wherein the polyisocyanates (a) comprise a prepolymer obtained by reacting a stoichiometric excess of aromatic isocyanates with polyetherpolyols.

9. The process according to claim 1 , wherein the carrier is at least one selected from the group consisting of a polymeric carrier, a metal carrier, and a painted metal carrier.

10. The process according to claim 1 , wherein the carrier is a door.

11. A polyurethane cast in place sealant, obtained by the process according to claim 1 .

Assignees

• Basf Se

Inventors

• Feng Yue Xia
• Chen Cheun Gwo
• Emge Andreas
• Di Jia Liang

Classifications

• C08G18/12

  using two or more compounds having active hydrogen in the first polymerisation step · CPC title

• C08G18/4812

  Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups · CPC title

• C08G18/4072

  Mixtures of compounds of group C08G18/63 with other macromolecular compounds · CPC title

• C08G18/14 Primary

  Manufacture of cellular products · CPC title

• C08G18/5021 Primary

  having nitrogen · CPC title