Heat curable binders

• US 20030027915A1
• Filed: 04/18/2002
• Published: 02/06/2003
• Est. Priority Date: 05/22/2001
• Status: Active Grant

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Gerst, Matthias, Laubender, Matthias, Reck, Bernd
• Granted Patent: US 6,730,729 B2
• Time in Patent Office: Days
• US Class Current: 524/460
• CPC Class Codes: C08F 2/26 anionic
• CPC Class Codes: C08F 2/44 Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• CPC Class Codes: C08F 220/1808 C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
• CPC Class Codes: C08F 265/02 on to polymers of acids, salts or anhydrides
• CPC Class Codes: C08K 5/5415 containing at least one Si—O bond

Abstract

The invention relates to a process for preparing an aqueous polymer dispersion comprising

an emulsion polymer

a polymer composed of at least 5% by weight of an ethylenically unsaturated monocarboxylic acid, dicarboxylic acid or dicarboxylic anhydride (acid polymer SP for short), and

an alkoxysilane of the formula

SiR¹R²R³R⁴

in which the groups R¹ to R⁴ independently of one another are each an organic radical with the proviso that at least one of the groups is an alkoxy group, which comprises preparing said emulsion polymer by emulsion polymerization in the presence of at least some of the alkoxysilane.

Claims

1. A process for preparing an aqueous polymer dispersion comprising

an emulsion polymer (EP for short)

a polymer composed of at least 5% by weight of an ethylenically unsaturated monocarboxylic acid, dicarboxylic acid or dicarboxylic anhydride (acid polymer SP for short), and

an alkoxysilane of the formula

SiR¹R²R³R⁴

in which the groups R¹ to R⁴ independently of one another are each an organic radical with the proviso that at least one of the groups is an alkoxy group, which comprises preparing said emulsion polymer by emulsion polymerization in the presence of at least some of the alkoxysilane.

2. A process as claimed in claim 1, wherein alkoxysilane is added before 70% by weight of the monomers of which the emulsion polymer is composed have undergone polymerization.

3. A process as claimed in claim 1, wherein the emulsion polymer is composed of at least 40% by weight of what are known as principal monomers, selected from C₁-C₂₀ alkyl (meth)acrylates, vinyl esters of carboxylic acids containing up to 20 carbon atoms, vinylaromatics having up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols containing 1 to 10 carbon atoms, aliphatic hydrocarbons having from 2 to 8 carbon atoms and 1 or 2 double bonds, and mixtures of these monomers.

4. A process as claimed in claim 1, wherein the emulsion polymerization takes place in the presence of at least some of the acid polymer.

5. A process as claimed in claim 4, wherein the acid polymer is composed of

from 50 to 99.5% by weight of at least one ethylenically unsaturated monocarboxylic or dicarboxylic acid, dicarboxylic anhydride or mixtures thereof,

from 0.5 to 50% by weight of at least one ethylenically unsaturated compound selected from the esters of ethylenically unsaturated monocarboxylic acids and the monoesters and diesters of ethylenically unsaturated dicarboxylic acids with an amine containing at least one hydroxyl group, and

if desired, up to 20% by weight of at least one further monomer.

6. A process as claimed in claim 1, wherein the aqueous polymer dispersion further comprises a polyol or alkanolamine containing at least two hydroxyl groups.

7. An aqueous polymer dispersion obtainable by the process as claimed in claim 1.

8. A molding or nonwoven of fibrous or particulate material selected in particular from glass fibers, wood fibers, textile fibers, mineral fibers, wood slivers and woodchips, cork chips, and sand, comprising as binder an aqueous dispersion as claimed in claim 7.