Maleic anhydride grafts of olefin polymers
AssigneeThe Dow Chemical Company
InventorsRicky L. Tabor, James A. Allen
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Abstract
Succinic acid or succinic anhydride grafts of HDPE are blended with ungrafted LLDPE and with ungrafted LDPE to form blends having useful adhesive properties. The succinic acid or succinic anhydride groups are provided by grafting, respectively, maleic acid or maleic anhydride onto HDPE. Laminates of the blends on various metals and polymers are shown.
Claims28
A blend consisting of grafted high density polyethylene, HDPE, with ungrafted LLDPE copolymer, having a density in the range of 0.88 to 0.935 g/cc, or ungrafted LDPE, having a density in the range of 0.91 to 0.93 g/cc,
- wherein the grafted HDPE consists essentially of HDPE, having initially a density in the range of 0.94 to 0.965 g/cc, which has been grafted with maleic acid or maleic anhydride, thereby providing succinic acid or succinic anhydride groups grafted along the HDPE polymer chain,
- said blend being in the form of a layer adhered to at least part of at least one substrate.
The laminate structure comprising at least one substrate having adhered to at least a portion thereof a blend of grafted HDPE and ungrafted LLDPE copolymer,
- said grafted HDPE consisting of HDPE which has been grafted with maleic acid or maleic anhydride, thereby providing succinic acid or succinic anhydride groups grafted along the HDPE polymer chain, and
- wherein the ungrafted LLDPE has a density in the range of about 0.90 g/cc to about 0.925 g/cc and has a C.sub.4 -C.sub.8 alkene comonomer content of about 1% to about 20% by weight.
A laminate structure comprising at least one substrate having adhered to at least a portion thereof a blend consisting of grafted HDPE/ungrafted LLDPE copolymer, having a density in the range of 0.88 to 0.935 g/cc, or a blend of grafted HDPE/ungrafted LDPE, having a density in the range of 0.91 to 0.93 g/cc, wherein the grafted HDPE consists of HDPE, having initially a density in the range of 0.94 to 0.965 g/cc, which has been grafted with maleic acid or maleic anhydride, thereby providing succinic acid or succinic anhydride groups grafted along the HDPE polymer chain.
Dependencies are inferred from the claim text.