PRODUCTION OF ELASTIC COMPOSITE ELASTOMER POLYURETHANE LEATHER Russian patent published in 2015 - IPC B32B27/40 B29C41/32 C08G18/08 C08G18/22 C08G18/48 C08G18/75 

FIELD: process engineering.

SUBSTANCE: in compliance with this invention, polyurethane reaction mix is sprayed on mould surface and cured thereon to get the leather ply. Said process comprises the steps that follow. Reaction mix is prepared from components including at least one isocyanate component, components that can react with isocyanate and metalorganic catalytic component. Note here that said isocyanate component comprises at least one isocyanate with two NCO-groups not connected directly to aromatic group while said catalytic component does not, in fact, contain lead. Note here that components that can react with isocyanate include component with active hydrogen atom consisting of at least one compound with functional groups composed of primary and/or secondary PH-groups, NH-groups and/or NH₂-groups. Aforesaid ply features rated functionality of 2 to 8 and equivalent weight of 100-4000, preferably, 500-2000. Polyurethane reaction mix is sprayed on mould surface and cured thereon to get the leather ply. Produced polyurethane ply is removed from mould surface. Note here that components that can react with isocyanate include at least one plasticizing agent including at least one group that can react with isocyanate to decrease coefficient of elasticity at flexure of leather. Note also that said plasticiser includes at least one group that can react with isocyanate group.

EFFECT: coefficient of elasticity at leather flexure lower than 35 MPa, preferably, lower than 30 MPa or even less, leather ply containing no lead.

15 cl, 4 dwg, 6 tbl, 6 ex