A method for manufacturing thermoplastic poly(vinyl alcohol) derivative in a melt state reaction and products thereof

A solid reaction product (OBJ1) that contains thermoplastic poly(vinyl alcohol) derivative (CMP1;

• CMP2;
• CMP3) comprising ester bonded pendant chains of which at least some end into vinyl groups, wherein the pendant chains which end into vinyl groups contain a catenated carbon structure of at least 4 carbon atoms, the solid reaction product (OBJ1) further comprising
• carboxylic acid residue (RD1;
• RD2;
• RD3), wherein the carboxylic acid residue (RD1;
• RD2;
• RD3) is organic compound that contains the same kind of catenated carbon structures of at least 4 carbon atoms that end into vinyl group as the pendant chains of the thermoplastic poly(vinyl alcohol) derivative (CMP1;
• CMP2;
• CMP3) and wherein the reaction product (OBJ1) has a melting point in a range of 170 to 210° C.

A paper substrate (SUBST 1) which is suitable for binding silicone (SIL1) in a catalytic hydrosilation reaction, the paper substrate (SUBST1) comprising

• a cellulose fiber-based support layer (PAP1) and
• a primer layer (PRIM1) which contains thermoplastic polyvinyl alcohol) derivative (CMP1;
• CMP2;
• CMP3) which contains ester bonded pendant chains of which at least some end into vinyl groups,
• wherein the ester bonded pendant chains that end into vinyl groups contain a catenated carbon structure of at least 4 carbon atoms, the primer layer (PRIM1) further comprising carboxylic acid residue (RD1;
• RD2;
• RD3) and/or salt of said carboxylic acid residue, and wherein the carboxylic acid residue (RD1;
• RD2;
• RD3) and/or the salt of said carboxylic acid residue is an organic compound that contains the same kind of catenated carbon structure of at least 4 carbon atoms that end into vinyl group as the ester bonded pendant chains.

A method for manufacturing a paper substrate which is suitable for binding silicone in a catalytic hydrosilation reaction, the method comprising:

• heating (HT1) thermoplastic poly(vinyl alcohol) (PVA1) having hydroxyl groups, wherein the thermoplastic poly(vinyl alcohol) (PVA1) has been dried and has a degree of hydrolysis in the range of 65 to 90 mol-%, and
• admixing (AD1) reagent (RGT1) with the thermoplastic poly(vinyl alcohol) (PVA1), wherein said reagent (RGT1) is an organic acid anhydride (AH1;
• AH2;
• AH3;
• AH4;
• AH5) having at least a chain which has a catenated carbon structure of at least 4 carbon atoms and which ends into a vinyl group, such that a mixture (MXT1) is obtained which contains molten thermoplastic poly(vinyl alcohol) (PVA1) having hydroxyl groups and organic acid anhydride (AH1;
• AH2;
• AH3;
• AH4;
• AH5) which contains chains which end into vinyl groups, and
• mixing (MR1) the mixture (MXT1) at a temperature which is above the melting point of the mixture (MXT1), thereby causing a reaction in a melt state, wherein at least some of the organic acid anhydride (AH1;
• AH2;
• AH3;
• AH4;
• AH5) reacts with the hydroxyl groups of the thermoplastic poly(vinyl alcohol) (PVA1) in an ester bond forming condensation reaction, such that reaction product (PROD1) is formed which contains
• carboxylic acid residue (RD1;
• RD2;
• RD3) of the ester bond forming condensation reaction, wherein at least some of said carboxylic acid residue (RD1 RD2;
• RD3) contains chains which end into vinyl groups, and
• thermoplastic poly(vinyl alcohol) derivative (CMP1;
• CMP2;
• CMP3), which contains ester bonded pendant chains of which at least some end into vinyl groups, and
• coating at least one side of a cellulose fiber-based support layer (PAP1) with a coating composition that contains the reaction product (PROD1), thereby forming a paper substrate (SUBST 1) with a primer layer (PRIM1) that contains thermoplastic poly(vinyl alcohol) derivative (CMP1;
• CMP2;
• CMP3) which contains ester bonded pendant chains of which at least some end into vinyl groups, wherein the pendant chains which end into vinyl groups contain a catenated carbon structure of at least 4 carbon atoms, the primer layer (PRIM1) further comprising carboxylic acid residue (RD1;
• RD2;
• RD3), wherein the carboxylic acid residue (RD1;
• RD2;
• RD3) is an organic compound that contains the same kind of catenated carbon structure of at least 4 carbon atoms that end into vinyl group as the pendant chains of the thermoplastic poly(vinyl alcohol) derivative (CMP1;
• CMP2;
• CMP3), the paper substrate (SUBST 1) thereby being suitable for binding silicone in a catalytic hydrosilation reaction.

Use of a carboxylic acid residue (RD1;

• RD2;
• RD3) of an ester bond forming condensation reaction, wherein at least some of said carboxylic acid residue (RD1;
• RD2;
• RD3) contains chains which end into vinyl groups, as a surfactant on a primer layer (PRIM1) of a paper substrate (SUBST 1) suitable for binding silicone in a catalytic hydrosilation reaction.