Pre-treatments for packaging print media
AssigneeHewlett-Packard Development Company, L.P.
InventorsRajasekar Vaidyanathan, Jason Swei
Life of this patent
Estimating the term…
Abstract
A pre-treatment coating composition includes evaporable liquid vehicle and a pre-treatment coating matrix, including from 30 wt % to 70 wt % multivalent organic salt, from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw, from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder. The low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio, and weight percentages are based on dry weight of the pre-treatment coating matrix.
Claims15
A pre-treatment coating composition, comprising:
- an evaporable liquid vehicle;
- and
- a pre-treatment coating matrix carried within the evaporable liquid vehicle, the pre-treatment coating matrix, comprising:
- from 30 wt % to 70 wt % multivalent organic salt,
- from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw,
- from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and
- from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder,
- wherein the low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio, and wherein weight percentages are based on dry weight of the pre-treatment coating matrix.
A packaging print medium, comprising:
- a media substrate including a first side and a second side;
- and
- a pre-treatment matrix layer on a first side of the media substrate, the pre-treatment matrix layer, comprising:
- from 30 wt % to 70 wt % multivalent organic salt,
- from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw,
- from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and
- from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder,
- wherein the low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment matrix layer at a 3:1 to 15:1 weight ratio, and wherein weight percentages are based on dry weight of the pre-treatment matrix layer.
A method of preparing a packaging print medium, comprising:
- coating a first side of media substrate with a pre-treatment coating composition, the pre-treatment coating composition comprising an evaporable liquid vehicle and a pre-treatment coating matrix carried within the evaporable liquid vehicle, the pre-treatment coating matrix, comprising:
- from 30 wt % to 70 wt % multivalent organic salt,
- from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw,
- from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and
- from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder,
- wherein the low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio, and wherein weight percentages are based on dry weight of the pre-treatment coating matrix;
- and
- drying the pre-treatment coating composition to remove evaporable liquid vehicle therefrom to form a pre-treatment matrix layer on the printing side.
Dependencies are inferred from the claim text.