Label laminate and novel paper substrate therefor

Claim 2

A label laminate comprising a release liner and a label layer thereon, said label layer comprising a paper facestock and an adhesive bonding said facestock to said release liner, said release liner comprising a paper substrate and a layer of a release agent between said substrate and said adhesive, the slope of the Neenah Hygroexpansivity hysterisis curve of the paper forming said substrate substantially matching the slope of the Neenah Hygroexpansivity hysterisis curve of the paper forming said facestock, the paper forming said substrate having a basis weight of 50 pounds per 3000 ft 2 ream or less, wherein the paper forming said substrate has an IGT Silicone Demand at 40 kg of <6 cm 3 /cm 2 and a Heat Stability of <0.5%, the cured silicone coating of said release liner exhibiting a Percent Silicone Extractables of <10%.

Claim 3

The laminate of claim 1, wherein the paper forming said substrate has a Water Cobb Size Test value of 15-27 gm/m 2 , a Neenah Hygroscopicity of <5% and an Apparent Density of 11.5-17 lbs/mil/ream.

Claim 4

The laminate of claim 2, wherein the paper forming said substrate exhibits the following properties: ______________________________________ Water Cobb Size Test 20-23 gm/m.sup.2 Neenah Hygroscopicity 0-2% IGT Silicone Demand at 40 kg <5.5 cm.sup.3 /cm.sup.2 Apparent Density 12-15 lbs/mil/ream Heat Stability <0.05% ______________________________________ and further wherein said release agent exhibits a Percent Extractables of 3 to 6%.

Claim 5

The laminate of claim 2, wherein the paper forming said substrate exhibits the following additional properties: ______________________________________ IGT Penetration, 6-12 cm Deflection <15% Tensile Stiffness Orientation <5% Backside Coefficient of Friction 0.3-0.8 Liner Stiffness, Machine Direction 100-200 mg Transverse Direction 40-80 mg Caliper 2.0-4.0 mils. ______________________________________

Claim 6

The laminate of claim 4, wherein the paper forming said substrate exhibits the following additional properties: ______________________________________ IGT Penetration, 7-10 cm Deflection <3% Tensile Stiffness Orientation <3% Backside Coefficient of 0.5-0.6 Friction Liner Stiffness Machine Direction 130-170 mg Transverse Direction 50-65 mg Caliper 2.75 ± 0.1 ______________________________________

Claim 7

The laminate of claim 4, wherein the paper forming said substrate exhibits the following additional properties: ______________________________________ Contact Angle 90-180° Parker Print Surface >3μ Squareness (MD/TD Ratio) 3 to 1 % Elongation Under Stress 0.5-2% Machine Direction Tensile Energy Absorption 5-15 kg · m/m.sup.2 ______________________________________

Claim 8

The laminate of claim 6, wherein the paper forming said substrate exhibits the following additional properties: ______________________________________ Contact Angle 100-130° Parker Print Surface 4.0-5.5μ Squareness (MD/TD Ratio) 1.5 to 1 % Elongation Under Stress 0.5-1% machine dir. Tensile Energy Absorption 7-10 kg · m/m.sup.2 ______________________________________

Claim 9

The laminate of claim 2, wherein the paper forming said laminate exhibits the following properties: ______________________________________ Water Cobb Size Test, gm/m.sup.2 20-23 gm/m.sup.2 Neenah Hygroscopicity 0-2% IGT Silicone Demand at 40 kg <5.5 cm.sup.3 /cm.sup.2 Apparent Density 12-15 lbs/mil/ream Heat Stability <0.05% IGT Penetration, 7-10 cm Deflection <3% Tensile Stiffness Orientation <3% Backside Coefficient of Friction 0.5-0.6 Liner Stiffness Machine Direction 130-170 mg Transverse Direction 50-65 mg Caliper 2.75 ± 0.1 Contact Angle 100-130° Parker Print Surface 4.0-5.5 Squareness (MD/TD Ratio) 1.5 to 1 % Elongation Under Stress .5-1% machine dir. Tensile Energy Absorption 7-10 kg · m/m.sup.2 ______________________________________ and further wherein said release agent exhibits a Percent Extractables of 3 to 6%.

Claim 10

The laminate of claim 2, wherein the paper forming said substrate has a basis weight of 45 pounds per 3000 ft 2 ream or less.

Claim 11

The laminate of claim 9, wherein the paper forming said substrate has a basis weight of about 40 pounds per 3000 ft 2 ream or less.

Claim 12

The laminate of claim 2, wherein said laminate has a Stiffness of 400 to 800 mg in the machine direction and 200 to 600 in the transverse direction.

Claim 13

The laminate of claim 11, wherein said laminate has a Stiffness of 500 to 700 mg in the machine direction and 300 to 500 in the transverse direction.

Claim 14

A label laminate comprising a release liner and a label layer thereon, said label layer comprising a paper facestock and an adhesive bonding said facestock to said release liner, said release liner comprising a paper substrate and a layer of a release agent between said substrate and said adhesive, wherein the slope of the lower portion of the Neenah Hygroexpansivity hysterisis curve of the paper forming said substrate within 5% of the slope of the lower portion of the Neenah Hygroexpansivity hysterisis curve of the paper forming said facestock, the paper forming said substrate having a basis weight of 50 pounds per 3000 ft 2 ream or less, wherein the paper forming said substrate has an IGT Silicone Demand at 40 kg of <6 cm 3 /cm 2 and a Heat Stability of <0.5%, the cured silicone coating of said release liner exhibiting a Percent Silicone Extractables of <1 0%.

Claim 15

A label laminate comprising a release liner and a label layer thereon, said label layer comprising a paper facestock and an adhesive bonding said facestock to said release liner, said release liner comprising a paper substrate and a layer of a release agent between said substrate and said adhesive, wherein the slope of the lower portion of the Neenah Hygroexpansivity hysterisis curve of the paper forming said substrate within 5% of the slope of the lower portion of the Neenah Hygroexpansivity hysterisis curve of the paper forming said facestock, the paper forming said substrate having a basis weight of 50 pounds per 3000 ft 2 ream or less, wherein the paper forming said substrate has an IGT Silicone Demand at 40 kg of <6 cm 3 /cm 2 and a Heat Stability of <0.5%, the cured silicone coating of said release liner exhibiting a Percent Silicone Extractables of <1 0%.

Claim 16

The label laminate of claim 2 wherein the liner is free of clay coatings.

Claim 17

The label laminate of claims 2 wherein the liner is not a super-calendared liner.