Pressure sensitive cohesive

A method of making a mailer type business form, comprising:

• (a) applying cohesive as cooperating patterns to a sheet of paper so that when the sheet is folded or moved into contact with a like coated sheet, the patterns move into contact with each other, the cohesive comprising a pressure sensitive cohesive including:
• 100 parts by weight natural rubber;
• at least one acrylate monomer at about 5-35% by weight of the natural rubber;
• acrylic acid 0.5-8% by weight of the natural rubber and/or 4-acetoxystyrene at about 1-10% by weight of the natural rubber;
• ethyl hexyl acrylate at about 0-20% by weight of the natural rubber;
• a finely divided hard particulate material having substantially no thermoplasticity at 0-50% by weight of the natural rubber;
• starch at 0-50% by weight of the natural rubber;
• and carboxylated styrene-butadiene latex, or carboxylated polychloroprene latex, or vinyl-pyridine styrene-butadiene latex, or styrene-acrylate-acrylonitrile latex, or pre-crosslinked natural rubber latex, or a tackifier, or combinations thereof at 0-40% by weight of the natural rubber.

A mailer type business form on which pressure sensitive adhesive/cohesive is applied, said pressure sensitive adhesive/cohesive comprising:

• a modified rubber latex synthesized by reacting 100 parts by weight natural rubber with at least one acrylate monomer and acrylic acid;
• and
• a finely divided hard particulate material, having substantially no thermoplasticity, at about 1-50% by weight of the natural rubber;
• wherein said at least one acrylate monomer is about 5-35% by weight of the natural rubber.

A mailer type business form on which pressure sensitive adhesive/cohesive is applied, said pressure sensitive adhesive/cohesive comprising:

• a modified rubber latex synthesized by reacting 100 parts by weight natural rubber with at least one acrylate monomer and 4-acetoxystyrene;
• and
• a finely divided hard particulate material, having substantially no thermoplasticity, at about 1-50% by weight of the natural rubber;
• wherein said at least one acrylate monomer is about 5-35% by weight of the natural rubber.

A mailer type business form on which pressure sensitive adhesive/cohesive is applied, said pressure sensitive adhesive/cohesive comprising:

• a modified rubber latex synthesized by reacting 100 parts by weight natural rubber with at least one acrylate monomer and ethyl hexyl acrylate;
• and
• a finely divided hard particulate material, having substantially no thermoplasticity, at about 1-50% by weight of the natural rubber;
• wherein said at least one acrylate monomer is about 5-35% by weight of the natural rubber.

A pressure sensitive adhesive/cohesive comprising:

• a modified rubber latex synthesized by reacting 100 parts by weight natural rubber with at least cyclohexane methacrylate and methyl methacrylate;
• and
• a finely divided hard particulate material, having substantially no thermoplasticity, at about 1-50% by weight of the natural rubber;
• wherein the cyclohexane methacrylate is about 2-6% by weight of the natural rubber and the methyl methacrylate is about 9-12% by weight of the natural rubber.