Calendering of polyolefins

Claim 2

A lubricant composition for polyolefins which comprises from about 60 to about 70 parts by weight of at least one N,N'-ethylenebis amide of a fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, from about 22 to about 32 parts by weight of at least one free fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, and from about 3 to about 13 parts by weight of a least one metal salt of at least one fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms.

Claim 3

A lubricant composition according to claim 1 wherein the N,N'-ethylenebis amide is N,N'-ethylenebis(stearamide).

Claim 4

A lubricant composition according to claim 1 wherein the free fatty acid is stearic acid.

Claim 5

A lubricant composition according to claim 1 wherein the metal salt is a salt of stearic acid.

Claim 6

A lubricant composition according to claim 4 wherein the metal salt is barium stearate.

Claim 7

A lubricant composition according to claim 4 wherein the metal salt is zinc stearate.

Claim 8

A lubricant composition according to claim 1 which comprises about 65 parts by weight of N,N'-ethylenebis(stearamide), about 27 parts by weight of stearic acid, and about 8 parts by weight of zinc stearate.

Claim 9

In a polyolefin composition comprising an intimate mixture of at least one polyolefin resin and a lubricant, the amount of said lubricant being from about 0.1 parts by weight to about 5 parts by weight per 100 parts by weight of said polyolefin resin, the improvement wherein said lubricant comprises: (a) from about 60 to about 70 parts by weight of at least one N,N'-ethylenebis amide of a fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, (b) from about 22 to about 32 parts by weight of at least one free fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, and (c) from about 3 to about 13 parts by weight of at least one metal salt of at least one fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms.

Claim 10

In a polyolefin composition comprising an intimate mixture of at least one polyolefin resin and a lubricant, the amount of said lubricant being from about 0.1 parts by weight to about 5 parts by weight per 100 parts by weight of said polyolefin resin, the improvement wherein said lubricant comprises: (a) from about 60 to about 70 parts by weight of at least one N,N'-ethylenebis amide of a fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, (b) from about 22 to about 32 parts by weight of at least one free fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, and (c) from about 3 to about 13 parts by weight of at least one metal salt of at least one fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms.

Claim 11

A polyolefin composition according to claim 8 wherein the N,N'-ethylenebis amide is N,N'-ethylenebis(stearamide).

Claim 12

A polyolefin composition according to claim 8 wherein the free fatty acid is stearic acid.

Claim 13

A polyolefin composition according to claim 8 wherein the metal salt is a salt of stearic acid.

Claim 14

A polyolefin composition according to claim 8 wherein the metal salt is barium stearate.

Claim 15

A polyolefin composition according to claim 8 wherein the metal salt is zinc stearate.

Claim 16

A polyolefin composition according to claim 8 wherein said lubricant comprises N,N'-ethylenebis(stearamide), stearic acid, and zinc stearate in a weight ratio of about 65/27/8.

Claim 17

A polyolefin composition according to claim 8 wherein the amount of said lubricant is from about 0.5 parts by weight to about 1 part by weight per 100 parts by weight of said polyolefin resin.

Claim 18

A polyolefin composition according to claim 8 wherein said polyolefin resin is a homopolymer of propylene.

Claim 19

A polyolefin composition according to claim 8 wherein said polyolefin resin is a copolymer of propylene and at least one other olefin.

Claim 20

A polyolefin composition according to claim 17 wherein said copolymer is a copolymer of propylene and ethylene.

Claim 21

A polyolefin composition according to claim 18 wherein said copolymer contains from about 3% to about 20% by weight of ethylene mers.

Claim 22

In a process for the manufacture of a smooth and uniform film or sheet of a polyolefin composition on a calender which comprises the steps of (a) feeding said polyolefin composition to a calender, all rolls of which are heated to a surface temperature above the crystallite melting point of the polyolefin component of said polyolefin composition, (b) raising the surface temperature of the calender rolls until a smooth rolling bank is formed at each nip and maintaining this temperature as long as said polyolefin composition is passing through the calender, and (c) taking off said film or sheet from the last calender roll and cooling it down to a temperature below its crystallite melting point, the improvement wherein said polyolefin composition comprises an intimate mixture of at least one polyolefin resin and from about 0.1 parts by weight to about 5 parts by weight per 100 parts by weight of polyolefin resin of a lubricant which comprises from about 60 to about 70 parts by weight of at least one N,N'-ethylenebis amide of a fatty acid or hydroxy-substituted fatty having from about 10 to about 22 carbon atoms, from about 22 to about 32 parts by weight of at least one free fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, and from about 3 to about 13 parts by weight of at least one metal salt of at least one fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms.

Claim 23

In a process for the manufacture of a smooth and uniform film or sheet of a polyolefin composition on a calender which comprises the steps of (a) feeding said polyolefin composition to a calender, all rolls of which are heated to a surface temperature above the crystallite melting point of the polyolefin component of said polyolefin composition, (b) raising the surface temperature of the calender rolls until a smooth rolling bank is formed at each nip and maintaining this temperature as long as said polyolefin composition is passing through the calender, and (c) taking off said film or sheet from the last calender roll and cooling it down to a temperature below its crystallite melting point, the improvement wherein said polyolefin composition comprises an intimate mixture of at least one polyolefin resin and from about 0.1 parts by weight to about 5 parts by weight per 100 parts by weight of polyolefin resin of a lubricant which comprises from about 60 to about 70 parts by weight of at least one N,N'-ethylenebis amide of a fatty acid or hydroxy-substituted fatty having from about 10 to about 22 carbon atoms, from about 22 to about 32 parts by weight of at least one free fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms, and from about 3 to about 13 parts by weight of at least one metal salt of at least one fatty acid or hydroxy-substituted fatty acid having from about 10 to about 22 carbon atoms.

Claim 24

A process according to claim 20 wherein said N,N'-ethylenebis amide is N,N'-ethylenebis(stearamide).

Claim 25

A process according to claim 20 wherein said free fatty acid is stearic acid.

Claim 26

A process according to claim 20 wherein said metal salt is a salt of stearic acid.

Claim 27

A process according to claim 20 wherein said metal salt is barium stearate.

Claim 28

A process according to claim 20 wherein said metal salt is zinc stearate.

Claim 29

A process according to claim 20 wherein said lubricant comprises N,N'-ethylenebis(stearamide), stearic acid, and zinc stearate in a weight ratio of about 65/27/8.

Claim 30

A process according to claim 20 wherein said polyolefin resin is a homopolymer of propylene.

Claim 31

A process according to claim 20 wherein said polyolefin resin is a copolymer of propylene and at least one other olefin.

Claim 32

A process according to claim 28 wherein said polyolefin resin is a copolymer of propylene and ethylene.

Claim 33

A process according to claim 29 wherein said copolymer contains from about 3% to about 20% by weight of ethylene mers.