Adhesive blends

Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers

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Details

428 3691, 428524, 525 66, 525 74, 525 77, 525382, B32B 2708, C08F 832, C08L 5100

Patent

active

056374100

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to polyolefin-containing adhesive blends and multi-layered structures comprising the adhesive blends, in particular multi-layered structures comprising at least one layer of a polyketone composition.
For the purposes of this patent, polyketones are defined as linear polymers having an alternating structure of (a) units derived from carbon monoxide and (b) units derived from one or more olefinically unsaturated compounds. Although for the purposes of this patent polyketones correspond to this idealised structure, it is envisaged that materials corresponding to this structure in the main but containing small regimes (i.e. up to 10 wt %) of the corresponding homopolymer or copolymer derived from the olefinically unsaturated compound, also fall within the definition.
Such polyketones have the formula: ##STR1## where the R groups are independently hydrogen or hydrocarbyl groups, and m is a large integer; they are disclosed in several patents e.g. U.S. Pat. No. 3,694,412. Processes for preparing the polyketones are disclosed in U.S. Pat. No. 3,694,412 and also in EP 181014 and EP 121965.
Polyolefin-containing blends suitable for use as adhesive layers in multi-layered structures are known. These adhesives blends are commonly referred to as tie-layers. For example, U.S. Pat. No. 2,081,723 discloses a modified polyolefin adhesive blend comprising (A) a graft copolymer of a polyethylene back-bone grafted with at least one polymerisable ethylenically unsaturated carboxylic acid or carboxylic acid anhydride and (B) a blending resin mixture comprising a linear low density polyethylene and polypropylene. The patent states that the adhesive blends can be used to join polypropylene to a number of polar materials or to join two polar materials together.
The present invention provides a polyolefin-containing adhesive blend and in particular it provides an adhesive blend suitable for bonding polyolefins in particular polyethylene or polypropylene to polyketones which blend has good adhesion to polyolefins while maintaining good adhesion to the polyketone.
Thus, according to the present invention there is provided a polyolefin-containing adhesive blend comprising; backbone grafted with 0.001 to 30% by weight of at least one polymerisable ethylenically unsaturated carboxylic acid or derivative thereof by weight of (B) is graft copolymer (A) has been reacted with a compound (D) which has at least two primary or secondary amino groups at least one of which is a primary amino group, the sum of (A), (B) and (C) being 100 parts by weight.
The polyolefin used as the backbone of the graft copolymer can be a homopolymer of an olefin e.g. ethylene or propylene, in particular high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) or very low density polyethylene (VLDPE), preferably LLDPE, or a copolymer of an olefin e.g. propylene with ethylene, butene or other unsaturated aliphatic hydrocarbons. Such homopolymers and copolymers are known and any such polymer can be used. Blends of two or more polyolefins can be used. It is preferred that the backbone of (A) is polypropylene or polyethylene; where the polyolefin backbone is a copolymer it is preferred that it comprises at least 80% of polymerised ethylene or 80% of polymerised propylene units. Where the adhesive blend of the present invention is used to bond a polyolefin to a polyketone, it is preferred that the polyolefin used in the backbone of (A) is the same as the polyolefin to be bonded. For example when polypropylene is to be bonded to polyketone by means of an adhesive blend of the present invention, component (A) is a graft copolymer of polypropylene.
Polymerisable ethylenically unsaturated carboxylic acids and derivatives thereof include, for example, acrylic acid, methacrylic acid, maleic acid, itaconic acid, citraconic acid, mesaconic acid, maleic anhydride, 4-methyl cyclohex-4-ene-1,2-dicarboxylic acid anhydride, bicyclo (2.2.2) oct-5-ene-2,3-dicarboxylic acid anhydride, 1,2,3,4,5,8,9,10-octa

REFERENCES:
patent: 4950541 (1990-08-01), Tabor et al.
patent: 4983435 (1991-01-01), Ueki et al.
patent: 5045401 (1991-09-01), Tabor et al.
patent: 5064724 (1991-11-01), Ofstein
patent: 5202192 (1993-04-01), Hope et al.
patent: 5278214 (1994-01-01), Moriya et al.
patent: 5373065 (1994-12-01), Kitazawa et al.
patent: 5444125 (1995-08-01), Tomita et al.

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