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Reinforcement of paper pulp-based materials using a reactive alkyd oligomer capable of forming a reprocessable reinforcement resin in situ

A reprocessing and pulping technology, applied in paper coating, papermaking, paper, etc., can solve problems such as high application temperature and expensive coating

Inactive Publication Date: 2013-02-06
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PVOH and soy-based coatings are expensive relative to polymer film-type coatings and wax coatings, they must be slurried with starch and other additives prior to application, and require considerably higher application temperatures (e.g. 60 ℃ to 70℃)

Method used

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  • Reinforcement of paper pulp-based materials using a reactive alkyd oligomer capable of forming a reprocessable reinforcement resin in situ
  • Reinforcement of paper pulp-based materials using a reactive alkyd oligomer capable of forming a reprocessable reinforcement resin in situ
  • Reinforcement of paper pulp-based materials using a reactive alkyd oligomer capable of forming a reprocessable reinforcement resin in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, a reworkable alkyd coated liner was produced. Glycerin (1 molar equivalent) and citric acid (1 molar equivalent) were heated at 100°C for 60 minutes in a hot air oven to form a mixture comprising glyceryl citrate alkyd oligomer, glycerol, and citric acid. This mixture was added to various amounts of hot water to form prepolymer liquids having the following concentrations: 50%, 60%, 70%, 80% and 90% by weight based on the total weight of the prepolymer liquid. % by weight of water. At 20.5°C, and at 12g / m 2 , 14g / m 2 and 16g / m 2 Coating weights of each prepolymer liquid were applied to backing boards (99g / m 2 base weigh). The weight of coating applied is varied by adjusting the pressure and speed of the size press. The prepolymer liquid was then dried at 108°C for about 3 minutes or about 10 minutes.

Embodiment 2

[0042] The mechanical properties of the coated liner from Example 1 were determined. Specifically, burst strength (TAPPI T810), thickness (TAPPI T411), water resistance (30 minute Cobb test, TAPPI T441), porosity (TAPPI T460) and ring pressure were determined for each alkyd coated liner (TAPPI T822). Compare the result with 117g / m 2 The basis weight of the uncoated liner was compared. Table 1 shows 99g / m 2 Basis weight and 117g / m 2 Mechanical properties of uncoated liners by basis weight.

[0043] Table 1 :

[0044]

[0045] Bursting strength

[0046] Alkyd Coated 99g / m 2 The burst strength of the liner increases with coat weight and the amount of alkyd oligomers and monomers in the prepolymer liquid. As shown in Table 2, 99g / m2 coated with prepolymer liquid 2 The bursting strength of the liner exceeds 117g / m 2 The burst strength of an uncoated liner, the prepolymer liquid having from about 50% to about 70% by weight water, based on the total weight of the pre...

Embodiment 3

[0067] The amount of alkyd coating (on a dry weight basis) was determined to be 99g / m 2 The effect of liner burst strength and ring pressure. The alkyd coated liner was prepared as described in Example 1. Bursting strength and ring pressure were determined as described in Example 2. Compare the result with the 99g / m 2 and 117g / m 2 Basis weights of uncoated liners were compared (Table 7).

[0068] Table 7 :

[0069]

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PUM

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Abstract

Disclosed herein are paper pulp-based materials that are reinforced with reprocessable alkyd resins, which are formed in situ with the materials. Also disclosed herein are methods for coating paper pulp-based materials with alkyd resins, and methods of recycling alkyd resin coated paper pulp-based materials.

Description

field of invention [0001] The present disclosure relates to strengthening pulp-based materials with reworkable alkyd resin coatings formed in situ from said materials, methods of coating pulp-based materials with alkyd resins, and uses thereof. Background of the invention [0002] Pulp-based materials such as paper, coverstock, and paperboard (eg, cardboard, liner, corrugated fiberboard) can be coated with reinforcing resins to improve their mechanical properties such as strength and water resistance. One type of coating traditionally used to reinforce pulp-based materials is made from high molecular weight viscous polymers. After the pulp-based material has been produced, the polymeric film-type coating is applied to the material via coextrusion at elevated temperature. While polymeric film-type coatings provide moisture resistance, low vapor permeability, aesthetic benefits, and do not require a curing step, their ability to penetrate or react with the cellulose structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/06D21H17/15D21H17/18D21H17/46D21H17/53D21H19/16D21H19/24D21H19/28D21H21/18
CPCD21H17/15D21H17/18D21H19/28D21H19/62D21H19/16D21H17/06D21H17/16D21H27/14D21H17/53D21H19/24D21H17/46D21H21/18Y10T428/277
Inventor 野田勇夫S·Y·兰尼W·M·小艾伦
Owner THE PROCTER & GAMBLE COMPANY
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