Polyurethane-forming composition with adjustable mix viscosity, geotextile composites prepared therefrom and a process for producing such composites

A polyurethane geotextile composite produced by impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a polymethylene poly (phenylisocyanate) having an NCO-content of from about 30 to 33% and a viscosity of from about 20 mPa·s to 2,000 mPa·s at 25° C.;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and allowing the impregnated mixture to cure.

A polyurethane geotextile composite produced by impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyoxypropylene polyether having a number average molecular weight of from 400 to 4,000 and an average functionality of from 2 to 3 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and allowing the impregnated mixture to cure.

A polyurethane geotextile composite produced by impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component selected from the group consisting of bis(4-aminocyclohexyl)methane, isophoronediamine, m-xylylenediamine and combinations thereof;
• and optionally,
• e) filler;
• and allowing the impregnated mixture to cure.

A process for producing a polyurethane geotextile composite comprising impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and allowing that mixture to cure.

A process for producing a polyurethane geotextile composite comprising impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a polymethylene poly (phenylisocyanate) having an NCO content of from about 30 to 33% and a viscosity of from about 20 mPa·s to 2,000 mPa·s at 25° C.;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and allowing that mixture to cure.

A process for producing a polyurethane geotextile composite comprising impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyoxypropylene polyether having a number average molecular weight of from 400 to 4,000 and an average functionality of from 2 to 3 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and allowing the impregnated mixture to cure.

A process for producing a polyurethane geotextile composite comprising impregnating a geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:

• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component selected from the group consisting of bis(4-amino-cyclohexyl)methane, isophoronediamine, m-xylylenediamine and combinations thereof;
• and
• optionally,
• e) filler;
• and allowing the impregnated mixture to cure.

A process for producing a polyurethane geotextle composite comprising:

• i) impregnating a first geotextile with a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:
• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• ii) impregnating a second geotextile with the polyurethane-forming reaction mixture with adjustable mix viscosity;
• iii) placing the second impregnated geotextile on top of the first impregnated geotextile;
• and
• iv) allowing the impregnated mixture in each geotextile to cure.

A process for producing a polyurethane geotextile composite comprising:

• i) spraying onto a geotextile a polyurethane-forming reaction mixture with adjustable mix viscosity comprising:
• a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight;
• b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 and 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
• c) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups;
• d) from 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component;
• and
• optionally,
• e) filler;
• and
• ii) allowing the applied mixture to cure.