Hewlett-packard Development Company, L.P.

Thomas Roger Oswald

John L Stoffel, Jr

Christopher Arend Toles

Xulong Fu

Silke Courtenay

Tao Chen

Bor-Jiunn Niu

Lokendra Pal

Robert J Lawton

George Bernhard Clifton

Gracy Apprisiani Wingkono

George B Clifton

The present disclosure is drawn to sizing compositions, which can include 25 wt % to 80 wt % starch based on dry components, 15 wt % to 60 wt % cationic multivalent salt based on dry components, and an organic additive. The organic additive can be a water-swellable polymer having a weight average molecular weight ranging from 150,000 Mw to 1,000,000 Mw, a wax, or both the water-swellable polymer and the wax.

Sizing compositions

An ink fixative solution including a polyvalent metal salt; a wax; a dispersing agent; and water in an amount to provide from about 10% to about 35% solids content in the ink fixative solution is disclosed

Ink fixative solution

The present disclosure is drawn to sizing compositions, which can include 40 wt % to 85 wt % starch based on dry components, 10 wt % to 40 wt % cationic multivalent salt based on dry components, and 1 wt % to 15 wt % inorganic pigment selected from a calcium carbonate, a swellable clay, or combination of the calcium carbonate and the swellable clay.

A lightweight digital printing medium has a basis weight of less than 100 grams per square meter and includes a base paper. The base paper includes a fiber mixture of hardwood pulp and softwood pulp where at least 5% by weight of total fiber in the fiber mixture is bleached, chemi-thermo-mechanical pulp. An internal sizing agent for neutral or alkaline conditions and a wet-strength agent that is a thermosetting resin are mixed with the fiber mixture. An amount of the wet-strength agent added to the fiber mixture is at least 0.1% total dry weight of the base paper.

Lightweight digital printing medium

A print medium having a base substrate including a blend of cellulosic fibers, a sizing material present in an effective amount from about 0 Kg/Ton of the print medium to about 1 Kg/Ton of the print medium, and a multivalent cation salt present in a synergistic amount from about 4 Kg/Ton of the print medium to about 25 Kg/Ton of the print medium.

Print media for inkjet printing

The present disclosure provides low grammage recording media, and associated methods and systems. In one example, a low grammage recording medium can comprise a raw base paper having a basis weight of 65 gsm or less, the raw base paper comprising wood fiber and 2 wt % to 10 wt % filler including calcium carbonate. A surface treatment solution is applied to the raw base paper and comprises a surface sizing agent and 3 wt % to 15 wt % calcium carbonate.

Low grammage recording medium

An uncoated recording medium includes a blend of hardwood fibers and softwood fibers. The total fiber content is at least 80 wt % of a total wt % of the uncoated recording medium. A filler is present in the uncoated recording medium in an amount ranging from about 3 wt % to about 10.2 wt % of the total wt % of the uncoated recording medium. The uncoated recording medium has i) a weight ranging from about 50 g/mto about 70 g/m, and ii) a machine direction Lorentezen & Wetter 5 degree bending stiffness ranging from about 0.19 mNm to about 0.27 mNm and a cross direction Lorentezen & Wetter 5 degree bending stiffness ranging from about 0.09 mNm to about 0.12 mNm, and iii) an ISO brightness of at least 86.

Uncoated recording media

An uncoated recording medium includes a blend of hardwood and softwood chemical pulp fibers, and thermomechanical pulp (TMP) fibers, with total fiber content at least 80 wt % of the medium's total wt %. Hardwood fibers range from about 20 wt % to about 70 wt %, softwood fibers range from about 30 wt % to about 50 wt %, and TMP fibers range from about 10 wt % to about 30 wt %, all relative to the total fiber content. A TiOamount ranges from about 1.5 wt % to about 6 wt % of the total wt %, and a bivalent or multivalent salt amount ranges from about 6,000 to about 16,000 &#x3bc;g/gram of the medium. The basis weight ranges from about 45 g/mto about 63 g/m.

Growing community of inventors

Boise, ID, United States of America

Thomas Roger Oswald